EnsureCapacity.java

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 * version 2 for more details (a copy is included in the LICENSE file that
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/**
 * @test
 * @bug 6992121
 * @summary Test the ArrayList.ensureCapacity() and Vector.ensureCapacity
 *    method with negative minimumCapacity input argument.
 */

import java.util.ArrayList;
import java.util.Vector;

public class EnsureCapacity {
    public static void main(String[] args) {
        testArrayList();
        testVector();
    }

    private static void checkCapacity(int before, int after) {
        if (before != after) {
            throw new RuntimeException("capacity is expected to be unchanged: " +
                "before=" + before + " after=" + after);
        }
    }

    private static void testArrayList() {
        ArrayList<String> al = new ArrayList<String>();
        al.add("abc");
        al.ensureCapacity(Integer.MIN_VALUE);

        // there is no method to query the capacity of ArrayList
        // so before and after capacity are not checked
    }

    private static void testVector() {
        Vector<String> vector = new Vector<String>();
        vector.add("abc");

        int cap = vector.capacity();
        vector.ensureCapacity(Integer.MIN_VALUE);
        checkCapacity(cap, vector.capacity());
    }
}