你能在Java中获得变量的先前值吗？

public class PreviousValue {
    public static void main(String[] args) {
        int currentValue = 10;
        int previousValue = 0;

        // 存储先前的值
        previousValue = currentValue;

        // 更新当前值
        currentValue = 20;

        System.out.println("先前的值: " + previousValue);
        System.out.println("当前的值: " + currentValue);
    }
}

public class PreviousValues {
    public static void main(String[] args) {
        int[] previousValues = new int[10];
        int currentValue = 0;

        // 存储先前的值
        for (int i = 0; i < 10; i++) {
            previousValues[i] = currentValue;
            currentValue += 10;
        }

        // 打印先前的值
        for (int i = 0; i < 10; i++) {
            System.out.println("先前的值 #" + (i+1) + ": " + previousValues[i]);
        }
    }
}