小编Pra*_*mer的帖子

这是我写的三个类:

public class Shape {

    public int x = 0;

    public void getArea() {
        System.out.println("I don't know my area!");
    }

    public String toString() {
        return "I am a shape!";
    }

    public int getX() {
        return x;
    }
}

public class Rectangle extends Shape {

    public int x = 1;

    public int getX() {
        return x;
    }

    public void getArea() {
        System.out.println("L*W");
    }

    public String toString() {
        return "I am a rectangle!";
    }
}

public class Tester {

    public static void …

System.out.println(Integer.MAX_VALUE);
System.out.println(Integer.MIN_VALUE);

打印:

2147483647
-2147483648

为什么最大值为2 ^ 31 -1(符号位为0并且不添加到数字的值),而最小值仅为-2 ^ 31(符号位为1并且确实添加到值然后？？).