在Java 9中，MethodHandles类的重要性是什么？

public class MethodHandles extends Object

Example

示例

import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;

public class MethodHandlesTest {
   public void MethodHandle1() {
      try {
         MethodHandle methodHandleLength = MethodHandles.arrayLength(int[].class);
         int[] array = new int[] {5, 10, 15, 20};
         int arrayLength = (int) methodHandleLength.invoke(array);
         System.out.println("Length of Array using Method Handle is: " + arrayLength);

         MethodHandle methodHandleConstructor = MethodHandles.arrayConstructor(int[].class);
         int[] newArray = (int[]) methodHandleConstructor.invoke(3);
         System.out.println("Array Constructed using Method Handle of Size: " + newArray.length);

         int x = (int) MethodHandles.zero(int.class).invoke();
         System.out.println("Default Value of Primitive Integer using Method Handles is: " + x);
         String y = (String) MethodHandles.zero(String.class).invoke();
         System.out.println("Default Value of String using Method Handles is: " + y);
      } catch(Throwable e) {
         e.printStackTrace();
      }
   }
   public static void main(String args[]) {
      new MethodHandlesTest().MethodHandle1();
   }
}

输出

Length of Array using Method Handle is: 4
Array Constructed using Method Handle of Size: 3
Default Value of Primitive Integer using Method Handles is: 0
Default Value of String using Method Handles is: null

以上就是在Java 9中，MethodHandles类的重要性是什么？的详细内容，更多请关注php中文网其它相关文章！