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黑马程序员

方法引用

package MethodReference;@FunctionalInterfacepublic interface Printable {
       void print(String str);}

package MethodReference;public class Printable_Demo {
       public static void main(String[] args) {
           printString(s->System.out.println(s));        System.out.println("************************");        printString(System.out::println);    }    public static void printString(Printable printable){
           printable.print("Hello,World");    }}

方法引用–通过对象名引用成员变量

package MethodReference02;@FunctionalInterfacepublic interface Printable {
       void print(String str);}

package MethodReference02;public class MethodRerObject {
       public void PrintUpperCassString(String str) {
           System.out.println(str.toUpperCase());    }}

package MethodReference02;public class Reference_Demo {
       public static void printString(Printable printable){
           printable.print("Hello");    }    public static void main(String[] args) {
           printString((s)->{
               new MethodRerObject().PrintUpperCassString(s);        });        printString(new MethodRerObject()::PrintUpperCassString);    }}

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