方法引用

`java
import java.util.function.Consumer;

/**

• 三种方法引用
  */
  public class MethodReference {

  /**

  • (args) -> ClassName.staticMethod(args);

  • ClassName::staticMethod;
    */
    public void test1() {
    Consumer consumer1
    = (String number) -> Integer.parseInt(number);

    Consumer consumer2
    = Integer::parseInt;
    }

  /**

  • (args) -> args.instanceMethod();

  • ClassName::instanceMethod;
    */
    public void test2() {
    Consumer consumer1
    = (String str) -> str.length();

    Consumer consumer2
    = String::length;
    }

  /**

  • (args) -> object.instanceMethod(args);

  • object::instanceMethod;
    */
    public void test3() {
    StringBuilder stringBuilder = new StringBuilder();

    Consumer consumer1
    = (String str) -> stringBuilder.append(str);

    Consumer consumer2
    = stringBuilder::append;
    }

}
`