小编flo*_*flo的帖子

我有这门课,我不明白到底是怎么回事:

public class Table {
    private int[][] array;
    private int N;

    // constructor
    public Table(int[][] array) {
        N = array.length;
        this.array = Arrays.copyOf(array, N);
    }

    // this method returns another Table object
    public Table tweak() {
        int[][] tweak = Arrays.copyOf(array, N);
        // here I change the array
        return new Table(tweak);
    }
}

问题是当我调用tweak方法时,用于调用方法的对象也会发生变化:

public class TestCls {
    public static void main(String[] args) {
        int[][] array = {{1, 2}, 
                         {3, 4}};
        Table a = new Table(array);
        System.out.println(a.toString());
        /* this will print …