什么是lambda expressions in java

        1. lambda expressions are used primarily to define inline implementation
 *      of a functional interface i.e. an interface with a single method only.
 *      
 *      2.Lambda expression elliminates the need of anonumous class and gives a

 *      very simple yet powerful functional programming capability to JAVA.

package com.github.jdk8;import java.util.ArrayList;import java.util.Collections;import java.util.Comparator;import java.util.List;import com.google.common.collect.Lists;/** * @see http://www.tutorialspoint.com/java8/java8_quick_guide.htm *  *      1. lambda expressions are used primarily to define inline implementation *      of a functional interface i.e. an interface with a single method only. *       *      2.Lambda expression elliminates the need of anonumous class and gives a *      very simple yet powerful functional programming capability to JAVA. * @author doctor * * @since 2015年1月18日 下午3:41:42 */public class Java8Overview {public static void main(String[] args) {List<String> list = Lists.newArrayList("name", "doctor", "sex", "address");List<String> arrayList = new ArrayList<>(list);// java8以前的排序Collections.sort(arrayList, new Comparator<String>() {@Overridepublic int compare(String o1, String o2) {return o1.compareTo(o2);}});System.out.println(list);System.out.println(arrayList);List<String> arrayList2 = new ArrayList<>(list);// java8　函数式编程Collections.sort(arrayList2, (a, b) -> a.compareTo(b));System.out.println(arrayList2);//MathOperation add = (int a, int b) -> a + b;System.out.println(add.operation(5, 5));System.out.println(operate(5, 5, add));System.out.println(operate(5, 5, (a, b) -> a + b));}private static interface MathOperation {int operation(int a, int b);}private static int operate(int a, int b, MathOperation operation) {return operation.operation(a, b);}}