diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..5f81826
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+.idea
+.gradle
+build/
\ No newline at end of file
diff --git a/FunctionalJava/build.gradle b/FunctionalJava/build.gradle
new file mode 100644
index 0000000..8c2ffda
--- /dev/null
+++ b/FunctionalJava/build.gradle
@@ -0,0 +1,14 @@
+group 'ru.spbau.shevchenko'
+version '1.0-SNAPSHOT'
+
+apply plugin: 'java'
+
+sourceCompatibility = 1.8
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testCompile group: 'junit', name: 'junit', version: '4.11'
+}
diff --git a/FunctionalJava/gradle/wrapper/gradle-wrapper.jar b/FunctionalJava/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..ca78035
Binary files /dev/null and b/FunctionalJava/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/FunctionalJava/gradle/wrapper/gradle-wrapper.properties b/FunctionalJava/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..77b2cde
--- /dev/null
+++ b/FunctionalJava/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Mon Oct 24 23:58:01 MSK 2016
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-2.13-bin.zip
diff --git a/FunctionalJava/gradlew b/FunctionalJava/gradlew
new file mode 100755
index 0000000..27309d9
--- /dev/null
+++ b/FunctionalJava/gradlew
@@ -0,0 +1,164 @@
+#!/usr/bin/env bash
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn ( ) {
+    echo "$*"
+}
+
+die ( ) {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules
+function splitJvmOpts() {
+    JVM_OPTS=("$@")
+}
+eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
+JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"
+
+exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@"
diff --git a/FunctionalJava/gradlew.bat b/FunctionalJava/gradlew.bat
new file mode 100644
index 0000000..f6d5974
--- /dev/null
+++ b/FunctionalJava/gradlew.bat
@@ -0,0 +1,90 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+if "%@eval[2+2]" == "4" goto 4NT_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+goto execute
+
+:4NT_args
+@rem Get arguments from the 4NT Shell from JP Software
+set CMD_LINE_ARGS=%$
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/FunctionalJava/settings.gradle b/FunctionalJava/settings.gradle
new file mode 100644
index 0000000..21b02ff
--- /dev/null
+++ b/FunctionalJava/settings.gradle
@@ -0,0 +1,2 @@
+rootProject.name = 'FunctionalJava'
+
diff --git a/FunctionalJava/src/main/java/Collections.java b/FunctionalJava/src/main/java/Collections.java
new file mode 100644
index 0000000..0167c79
--- /dev/null
+++ b/FunctionalJava/src/main/java/Collections.java
@@ -0,0 +1,55 @@
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+/**
+ * Created by ilya on 10/25/16.
+ */
+public class Collections {
+    public static <Return, Param> List<Return> map(Function1<? super Param, ? extends Return> f, Iterable<Param> iterable){
+        List<Return> result = new ArrayList<>();
+        iterable.forEach(param -> result.add(f.apply(param)));
+        return result;
+    }
+    public static <Param> List<Param> filter(Predicate<? super Param> f, Iterable<Param> iterable){
+        List<Param> result = new ArrayList<>();
+        for(Param param : iterable){
+            if (f.apply(param)){
+                result.add(param);
+            }
+        }
+        return result;
+    }
+    public static <Param> List<Param> takeWhile(Predicate<? super Param> f, Iterable<Param> iterable){
+        List<Param> result = new ArrayList<>();
+        for(Param param : iterable){
+            if (f.apply(param)){
+                result.add(param);
+            }
+            else{
+                break;
+            }
+        }
+        return result;
+    }
+    public static <Param> List<Param> takeUnless(Predicate<? super Param> f, Iterable<Param> iterable){
+        return takeWhile(f.not(), iterable);
+    }
+    public static <Return> Return foldl(Function2<? super Return, ? super Return, ? extends Return> f, Return ini, Iterable<Return> iterable){
+        Return result = ini;
+        for(Return a : iterable){
+            result = f.apply(result, a);
+        }
+        return result;
+    }
+    public static <Return> Return foldr(Function2<? super Return, ? super Return, ? extends Return> f, Return ini, Iterable<Return> iterable){
+        return foldr(f, ini, iterable.iterator());
+    }
+    private static <Return> Return foldr(Function2<? super Return, ? super Return, ? extends Return> f, Return ini, Iterator<Return> iterator) {
+        if(!iterator.hasNext()){
+            return ini;
+        }
+        Return first = iterator.next();
+        return f.apply(first, foldr(f, ini, iterator));
+    }
+}
diff --git a/FunctionalJava/src/main/java/Function1.java b/FunctionalJava/src/main/java/Function1.java
new file mode 100644
index 0000000..483a8a1
--- /dev/null
+++ b/FunctionalJava/src/main/java/Function1.java
@@ -0,0 +1,10 @@
+/**
+ * Created by ilya on 10/24/16.
+ */
+public interface Function1<Param, Return> {
+    Return apply(Param xw);
+
+    default <R> Function1<Param, R> compose(Function1<? super Return, ? extends R> g) {
+        return param -> g.apply(apply(param));
+    }
+}
diff --git a/FunctionalJava/src/main/java/Function2.java b/FunctionalJava/src/main/java/Function2.java
new file mode 100644
index 0000000..86067c8
--- /dev/null
+++ b/FunctionalJava/src/main/java/Function2.java
@@ -0,0 +1,20 @@
+/**
+ * Created by ilya on 10/25/16.
+ */
+public interface Function2<Param1, Param2, Return> {
+    Return apply(Param1 x, Param2 y);
+
+    default <R> Function2<Param1, Param2, R> compose(Function1<? super Return, ? extends R> g){
+        return (param1, param2) -> g.apply(apply(param1, param2));
+    }
+    default Function1<Param2, Return> bind1(Param1 param1){
+        return param2 -> apply(param1, param2);
+    }
+    default Function1<Param1, Return> bind2(Param2 param2){
+        return param1 -> apply(param1, param2);
+    }
+    default Function1<Param1, Function1<Param2, Return>> curry(){
+        return this::bind1;
+    }
+}
+
diff --git a/FunctionalJava/src/main/java/Predicate.java b/FunctionalJava/src/main/java/Predicate.java
new file mode 100644
index 0000000..eb8c2ad
--- /dev/null
+++ b/FunctionalJava/src/main/java/Predicate.java
@@ -0,0 +1,17 @@
+/**
+ * Created by ilya on 10/25/16.
+ */
+public interface Predicate<Param> extends Function1<Param, Boolean>{
+    Predicate<Object> ALWAYS_TRUE = x -> true;
+    Predicate<Object> ALWAYS_FALSE = x -> false;
+
+    default Predicate<Param> not(){
+        return param -> !apply(param);
+    }
+    default Predicate<Param> or(Predicate<? super Param> g){
+        return param -> apply(param) || g.apply(param);
+    }
+    default Predicate<Param> and(Predicate<? super Param> g){
+        return param -> apply(param) && g.apply(param);
+    }
+}
diff --git a/FunctionalJava/src/test/java/CollectionsTest.java b/FunctionalJava/src/test/java/CollectionsTest.java
new file mode 100644
index 0000000..cc1df27
--- /dev/null
+++ b/FunctionalJava/src/test/java/CollectionsTest.java
@@ -0,0 +1,95 @@
+import org.junit.Test;
+
+import java.util.*;
+//import java.util.Collections;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Created by ilya on 10/25/16.
+ */
+public class CollectionsTest {
+    @Test
+    public void mapSimple() throws Exception {
+        List<Integer> array = Arrays.asList(1, 2, 3, 4, 5);
+        List<Integer> squaredArray = Collections.map(xw -> xw*xw, array);
+        assertEquals(Arrays.asList(1, 4, 9, 16, 25), squaredArray);
+    }
+
+    @Test
+    public void mapEmpty() throws Exception {
+        List<Integer> array = java.util.Collections.emptyList();
+        List<Integer> mappedArray = Collections.map(xw -> xw*xw, array);
+        assertEquals(java.util.Collections.emptyList(), mappedArray);
+    }
+
+    @Test
+    public void filterSimple() throws Exception {
+        List<Integer> array = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
+        List<Integer> filteredArray = Collections.filter(xw -> xw % 2 == 0, array);
+        assertEquals(Arrays.asList(2, 4, 6, 8, 10), filteredArray);
+    }
+
+    @Test
+    public void filterEmpty() throws Exception {
+        List<Integer> array = java.util.Collections.emptyList();
+        List<Integer> filteredArray = Collections.filter(xw -> xw % 2 == 0, array);
+        assertEquals(java.util.Collections.emptyList(), filteredArray);
+    }
+
+
+    @Test
+    public void takeWhile() throws Exception {
+        List<Integer> array = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
+        List<Integer> takenArray = Collections.takeWhile(xw -> xw <= 5, array);
+        assertEquals(Arrays.asList(1, 2, 3, 4, 5), takenArray);
+    }
+
+    @Test
+    public void takeWhileEmpty() throws Exception {
+        List<Integer> array = java.util.Collections.emptyList();
+        List<Integer> takenArray = Collections.takeWhile(xw -> xw <= 5, array);
+        assertEquals(java.util.Collections.emptyList(), takenArray);
+    }
+
+
+    @Test
+    public void takeUnless() throws Exception {
+        List<Integer> array = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
+        List<Integer> takenArray = Collections.takeUnless(xw -> xw > 5, array);
+        assertEquals(Arrays.asList(1, 2, 3, 4, 5), takenArray);
+    }
+
+    @Test
+    public void takeUnlessEmpty() throws Exception {
+        List<Integer> array = java.util.Collections.emptyList();
+        List<Integer> takenArray = Collections.takeUnless(xw -> xw > 5, array);
+        assertEquals(java.util.Collections.emptyList(), takenArray);
+    }
+
+    @Test
+    public void foldlSimple() throws Exception {
+        List<String> array = Arrays.asList("1", "2", "3", "4", "5");
+        String result = Collections.foldl(String::concat, "0", array);
+        assertEquals("012345", result);
+    }
+    @Test
+    public void foldlEmpty() throws Exception {
+        List<Integer> array = java.util.Collections.emptyList();
+        int result = Collections.foldl((x, y) -> x + y, 0, array);
+        assertEquals(0, result);
+    }
+    @Test
+    public void foldrSimple() throws Exception {
+        List<String> array = Arrays.asList("1", "2", "3", "4", "5");
+        String result = Collections.foldr(String::concat, "0", array);
+        assertEquals("123450", result);
+    }
+    @Test
+    public void foldrEmpty() throws Exception {
+        List<Integer> array = java.util.Collections.emptyList();
+        int result = Collections.foldr((x, y) -> x + y, 0, array);
+        assertEquals(0, result);
+    }
+
+}
\ No newline at end of file
diff --git a/FunctionalJava/src/test/java/Function1Test.java b/FunctionalJava/src/test/java/Function1Test.java
new file mode 100644
index 0000000..077d3c1
--- /dev/null
+++ b/FunctionalJava/src/test/java/Function1Test.java
@@ -0,0 +1,18 @@
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Created by ilya on 10/25/16.
+ */
+public class Function1Test {
+    @Test
+    public void compose() throws Exception {
+        Function1<Integer, Integer> square = param -> param * param;
+        Function1<Integer, Integer> add3 = param -> param + 3;
+        Function1<Integer, Integer> sqrAdd3 = square.compose(add3);
+
+        assertEquals(Integer.valueOf(12), sqrAdd3.apply(3));
+    }
+
+}
\ No newline at end of file
diff --git a/FunctionalJava/src/test/java/Function2Test.java b/FunctionalJava/src/test/java/Function2Test.java
new file mode 100644
index 0000000..5daecdf
--- /dev/null
+++ b/FunctionalJava/src/test/java/Function2Test.java
@@ -0,0 +1,39 @@
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Created by ilya on 10/25/16.
+ */
+public class Function2Test {
+    @Test
+    public void compose() throws Exception {
+        Function2<Integer, Integer, Integer> multiply = (param1, param2) -> param1 * param2;
+        Function1<Integer, Integer> add2 = param -> param + 2;
+        Function2<Integer, Integer, Integer> multiplyAdd3 = multiply.compose(add2);
+        assertEquals(Integer.valueOf(12), multiplyAdd3.apply(2,5));
+    }
+
+    @Test
+    public void bind1() throws Exception {
+        Function2<Integer, Integer, Integer> multiply = (param1, param2) -> param1 * param2;
+        Function1<Integer, Integer> multiplyBy2 = multiply.bind1(2);
+        assertEquals(Integer.valueOf(12), multiplyBy2.apply(6));
+    }
+
+    @Test
+    public void bind2() throws Exception {
+        Function2<Integer, Integer, Integer> multiply = (param1, param2) -> param1 * param2;
+        Function1<Integer, Integer> multiplyBy2 = multiply.bind2(2);
+        assertEquals(Integer.valueOf(12), multiplyBy2.apply(6));
+    }
+
+    @Test
+    public void curry() throws Exception {
+        Function2<Integer, Integer, Integer> multiply = (param1, param2) -> param1 * param2;
+        Function1<Integer, Integer> multiplyBy2 = multiply.curry().apply(2);
+        assertEquals(Integer.valueOf(12), multiplyBy2.apply(6));
+
+    }
+
+}
\ No newline at end of file
diff --git a/FunctionalJava/src/test/java/PredicateTest.java b/FunctionalJava/src/test/java/PredicateTest.java
new file mode 100644
index 0000000..a43aee0
--- /dev/null
+++ b/FunctionalJava/src/test/java/PredicateTest.java
@@ -0,0 +1,86 @@
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * Created by ilya on 10/25/16.
+ */
+public class PredicateTest {
+    private static final Predicate<Object> UNDEFINED = x -> {throw new IllegalStateException();};
+    private static final Predicate<Integer> IS3 = x -> x == 3;
+    @Test
+    public void testConstants(){
+        assertEquals(Boolean.TRUE, Predicate.ALWAYS_TRUE.apply(new Object()));
+        assertEquals(Boolean.FALSE, Predicate.ALWAYS_FALSE.apply(new Object()));
+    }
+    @Test
+    public void not() throws Exception {
+        assertTrue(IS3.apply(3));
+        assertFalse(IS3.apply(1));
+        assertFalse(IS3.apply(2));
+        assertFalse(IS3.apply(4));
+        Predicate<Integer> isNot3 = IS3.not();
+        assertFalse(isNot3.apply(3));
+        assertTrue(isNot3.apply(1));
+        assertTrue(isNot3.apply(2));
+        assertTrue(isNot3.apply(4));
+    }
+
+    @Test
+    public void or() throws Exception {
+        Predicate<Integer> is5 = param -> param == 5;
+        Predicate<Integer> is3or5 = IS3.or(is5);
+        assertTrue(is3or5.apply(3));
+        assertTrue(is3or5.apply(5));
+        assertFalse(is3or5.apply(2));
+        assertFalse(is3or5.apply(4));
+    }
+
+    @Test
+    public void and() throws Exception {
+        Predicate<Integer> less6 = param -> param < 6;
+        Predicate<Integer> greater2 = param -> param > 2;
+        Predicate<Integer> between3and5 = less6.and(greater2);
+        for (int i = 3; i <= 5; i++) {
+            assertTrue(between3and5.apply(i));
+        }
+        assertFalse(between3and5.apply(1));
+        assertFalse(between3and5.apply(2));
+        assertFalse(between3and5.apply(100));
+        assertFalse(between3and5.apply(-1));
+    }
+
+    @Test
+    public void orLaziness() {
+        Predicate<Integer> is3orThrow = IS3.or(UNDEFINED);
+        boolean thrown = false;
+        try{
+            is3orThrow.apply(4);
+        }
+        catch (Exception e){
+            thrown = true;
+        }
+        finally {
+            assertTrue(thrown);
+        }
+        assertTrue(is3orThrow.apply(3));
+    }
+
+    @Test
+    public void andLaziness() {
+        Predicate<Integer> isNot3orThrow = IS3.and(UNDEFINED);
+        boolean thrown = false;
+        try{
+            isNot3orThrow.apply(3);
+        }
+        catch (Exception e){
+            thrown = true;
+        }
+        finally {
+            assertTrue(thrown);
+        }
+        assertFalse(isNot3orThrow.apply(4));
+    }
+}
\ No newline at end of file