test/langtools/tools/javac/lambda/LambdaConv05.java

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/*
 * @test
 * @bug 8003280
 * @summary Add lambda tests
 *  function type and method type inference
 * @author  Alex Buckley
 * @author  Maurizio Cimadamore
 * @run main LambdaConv05
 */

import java.util.*;

public class LambdaConv05 {

    static void assertTrue(boolean cond) {
        if (!cond)
            throw new AssertionError();
    }

    int count = 0;

    void sort(List<String> data) {
      Collections.sort(data,
                       (String a, String b) -> { LambdaConv05.this.count++; return a.length()-b.length(); });
    }

    public static void main(String[] args) {
        ArrayList<String> arr = new ArrayList<>();
        arr.add("Three");
        arr.add("Four");
        arr.add("One");
        LambdaConv05 sorter = new LambdaConv05();
        sorter.sort(arr);
        assertTrue(arr.get(0).equals("One"));
        assertTrue(arr.get(1).equals("Four"));
        assertTrue(arr.get(2).equals("Three"));
        assertTrue(sorter.count == 2);
    }
}