Java中方法的引用

Posted 2021-03-16 路上的风景

package com.fgy.demo2;

public interface Printable {
    void print(String s);
}

package com.fgy.demo2;

public class Demo01Printable {
    public static void main(String[] args) {
        // printString(s -> System.out.println(s));

        // // 使用方法引用进行优化
        printString(System.out::println);
    }

    private static void printString(Printable p) {
        p.print("HelloWord");
    }
}

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package com.fgy.demo3;

public interface Printable {
    void print(String s);
}

package com.fgy.demo3;

public class MethodRerObject {
    public void printUpperCaseString(String s) {
        System.out.println(s.toUpperCase());
    }
}

package com.fgy.demo3;

/**
 * 通过对象名引用成员方法
 */
public class Demo01ObjectMethodReference {
    public static void main(String[] args) {
        /*printString(s -> {
            MethodRerObject obj = new MethodRerObject();
            obj.printUpperCaseString(s);
        });*/

        // 使用方法引用进行优化
        printString(new MethodRerObject()::printUpperCaseString);
    }

    private static void printString(Printable p) {
        p.print("Hello word");
    }
}