JAVA，在树状图中想要改变值，在对象中？

class TreeNode {
    private int value;
    private TreeNode left;
    private TreeNode right;

    public TreeNode(int value) {
        this.value = value;
    }

    public void setValue(int newValue) {
        this.value = newValue;
    }

    // 其他方法和属性的定义...

    public static void main(String[] args) {
        // 创建树状结构
        TreeNode root = new TreeNode(1);
        TreeNode leftChild = new TreeNode(2);
        TreeNode rightChild = new TreeNode(3);
        root.left = leftChild;
        root.right = rightChild;

        // 修改节点的值
        leftChild.setValue(4);

        // 打印修改后的值
        System.out.println(leftChild.value);  // 输出: 4
    }
}