test/langtools/tools/javac/lambda/methodReferenceExecution/MethodReferenceTestVarHandle.java

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/**
 * @test
 * @summary test for VarHandle signature polymorphic methods
 * @run testng MethodReferenceTestVarHandle
 */

import java.lang.invoke.*;
import java.util.*;

import org.testng.annotations.Test;
import static org.testng.Assert.assertEquals;

@Test
public class MethodReferenceTestVarHandle {

  interface Setter {
      void apply(int[] arr, int idx, int val);
  }

  interface Getter {
      int apply(int[] arr, int idx);
  }

  public void testSet() throws Throwable {
      VarHandle vh = MethodHandles.arrayElementVarHandle(int[].class);

      Setter f = vh::set;

      int[] data = {0};
      f.apply(data, 0, 42);
      assertEquals(42, data[0]);
  }

  public void testGet() throws Throwable {
      VarHandle vh = MethodHandles.arrayElementVarHandle(int[].class);

      Getter f = vh::get;

      int[] data = {42};
      int v = f.apply(data, 0);
      assertEquals(42, v);
  }
}