annotation-file-utilities/tests/LambdaExpression.goal

import java.lang.annotation.Target;
import java.lang.annotation.ElementType;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.IntBinaryOperator;
import java.util.function.IntFunction;
import java.util.function.Predicate;
import java.util.function.Supplier;
import java.util.function.ToIntBiFunction;

@Target(ElementType.TYPE_USE) @interface A {}

@Target(ElementType.TYPE_USE) @interface B {}

@Target(ElementType.TYPE_USE) @interface C {}

@skip-test
class LambdaExpression {
  //Single inferred-type parameter
  IntFunction<Integer> f0 = (x) -> x+1;

  //Parentheses optional for single inferred-type parameter
  IntFunction<Integer> f1 = x -> x+1;

  //Single declared-type parameter, expression body
  IntFunction<Integer> f2 = (@A int x) -> x+1;

  //Single declared-type parameter, block body
  IntFunction<Integer> f3 = (@A int x) -> { return x+1; };

  //Multiple declared-type parameters
  IntBinaryOperator f4 = (@A int x, @B int y) -> x+y;

  //Generic argument type
  static final ToIntBiFunction<String[], List<? extends CharSequence>>
  selectCommon = (@A String @B [] array,
                  @A List<@B ? extends @C CharSequence> list) ->
    {
      int total = 0;
      for (int i = 0; i < array.length; i++) {
        Iterator<? extends CharSequence> iter = list.iterator();
        String str = array[i];
        while (iter.hasNext()) {
          CharSequence seq = iter.next();
          if (seq.toString().equals(str)) {
            ++total;
            iter.remove();
            break;
          }
        }
      }
      return total;
    };

  public static void main(String[] args) {
    String[] ss = {"a", "b"};
    System.out.println(selectCommon.applyAsInt(args, Arrays.asList(ss)));
  }
}