java - 为什么我的 for 循环在 java 中不能正确递增？

Question

我已经尝试解决这个问题几个小时：为什么当 l 循环还没有完成时 j 和其他变量会发生变化？这是我的代码：

public class main
{

        public static void main (String[] args)
        {

        String name=args[0];
        double a=Double.parseDouble(args[1]);
        double b=Double.parseDouble(args[2]);
        double c=Double.parseDouble(args[3]);
        double d=Double.parseDouble(args[4]);

        //for complexes
        for (double i = -a; i<=a; i++){
            for (double j = -b; j<=b; j++){
                for (double k = -c; k<=c; k++){
                    for (double l = -d; l<=d; l++){
                        complex c1 = new complex (i, j);
                        complex c2 = new complex (k, l);
                        System.out.println(c1+"; "+c2);

                    }

                }
            }
        }
    }
}

//And the complex class:


public class complex {
    private static double c;
    private static double n;

    public complex(double c, double n){
        this.c=c;
        this.n=n;
    }
    public String toString(){
        if ((n==0)&&(c==0))
            return "0";
        if (n==0)
            return ""+c;
        if (c==0)
            return ""+n+"i";
        else return ""+c+"+"+n+"i";
    }
}

输出是：

-1.0+-2.0i; -1.0+-2.0i
-1.0+-1.0i; -1.0+-1.0i
-1.0; -1.0
-1.0+1.0i; -1.0+1.0i
-1.0+2.0i; -1.0+2.0i
-2.0i; -2.0i
-1.0i; -1.0i
0; 0
1.0i; 1.0i
ect.

但输出应该是

-1.0-2.0i; -1.0-2.0i
-1.0-2.0i; -1.0-1.0i
-1.0-2.0i; -1.0
-1.0-2.0i; -1.0+1.0i
-1.0-2.0i; -1.0+2.0i
-1.0-2.0i; -2.0i
ect.

但是复杂类中的任何东西都不重要，对吧？因为即使我使用了同名的变量，它们也不应该从他们的类之外访问，对吧？非常感谢您的帮助！我也问过其他人，也没有人能够发现我的错误，所以任何事情都非常感谢。

编辑：

我之前没有发布完整的输出。这是我得到的输出：

-1.0+-2.0i; -1.0+-2.0i
-1.0+-1.0i; -1.0+-1.0i
-1.0; -1.0
-1.0+1.0i; -1.0+1.0i
-1.0+2.0i; -1.0+2.0i
-2.0i; -2.0i
-1.0i; -1.0i
0; 0
1.0i; 1.0i
2.0i; 2.0i
1.0+-2.0i; 1.0+-2.0i
1.0+-1.0i; 1.0+-1.0i
1.0; 1.0
1.0+1.0i; 1.0+1.0i
1.0+2.0i; 1.0+2.0i
-1.0+-2.0i; -1.0+-2.0i
-1.0+-1.0i; -1.0+-1.0i
-1.0; -1.0
-1.0+1.0i; -1.0+1.0i
-1.0+2.0i; -1.0+2.0i
-2.0i; -2.0i
-1.0i; -1.0i
0; 0
1.0i; 1.0i
2.0i; 2.0i
1.0+-2.0i; 1.0+-2.0i
1.0+-1.0i; 1.0+-1.0i
1.0; 1.0
1.0+1.0i; 1.0+1.0i
1.0+2.0i; 1.0+2.0i
-1.0+-2.0i; -1.0+-2.0i
-1.0+-1.0i; -1.0+-1.0i
-1.0; -1.0
-1.0+1.0i; -1.0+1.0i
-1.0+2.0i; -1.0+2.0i
-2.0i; -2.0i
-1.0i; -1.0i
0; 0
1.0i; 1.0i
2.0i; 2.0i
1.0+-2.0i; 1.0+-2.0i
1.0+-1.0i; 1.0+-1.0i
1.0; 1.0
1.0+1.0i; 1.0+1.0i
1.0+2.0i; 1.0+2.0i
-1.0+-2.0i; -1.0+-2.0i
-1.0+-1.0i; -1.0+-1.0i
-1.0; -1.0
-1.0+1.0i; -1.0+1.0i
-1.0+2.0i; -1.0+2.0i
-2.0i; -2.0i
-1.0i; -1.0i
0; 0
1.0i; 1.0i
2.0i; 2.0i
1.0+-2.0i; 1.0+-2.0i
1.0+-1.0i; 1.0+-1.0i
1.0; 1.0
1.0+1.0i; 1.0+1.0i
1.0+2.0i; 1.0+2.0i
-1.0+-2.0i; -1.0+-2.0i
-1.0+-1.0i; -1.0+-1.0i
-1.0; -1.0
-1.0+1.0i; -1.0+1.0i
-1.0+2.0i; -1.0+2.0i
-2.0i; -2.0i
-1.0i; -1.0i
0; 0
1.0i; 1.0i
2.0i; 2.0i
1.0+-2.0i; 1.0+-2.0i
1.0+-1.0i; 1.0+-1.0i
1.0; 1.0
1.0+1.0i; 1.0+1.0i
1.0+2.0i; 1.0+2.0i
-1.0+-2.0i; -1.0+-2.0i
-1.0+-1.0i; -1.0+-1.0i
-1.0; -1.0
-1.0+1.0i; -1.0+1.0i
-1.0+2.0i; -1.0+2.0i
-2.0i; -2.0i
-1.0i; -1.0i
0; 0
1.0i; 1.0i
2.0i; 2.0i
1.0+-2.0i; 1.0+-2.0i
1.0+-1.0i; 1.0+-1.0i
1.0; 1.0
1.0+1.0i; 1.0+1.0i
1.0+2.0i; 1.0+2.0i
-1.0+-2.0i; -1.0+-2.0i
-1.0+-1.0i; -1.0+-1.0i
-1.0; -1.0
-1.0+1.0i; -1.0+1.0i
-1.0+2.0i; -1.0+2.0i
-2.0i; -2.0i
-1.0i; -1.0i
0; 0
1.0i; 1.0i
2.0i; 2.0i
1.0+-2.0i; 1.0+-2.0i
1.0+-1.0i; 1.0+-1.0i
1.0; 1.0
1.0+1.0i; 1.0+1.0i
1.0+2.0i; 1.0+2.0i
-1.0+-2.0i; -1.0+-2.0i
-1.0+-1.0i; -1.0+-1.0i
-1.0; -1.0
-1.0+1.0i; -1.0+1.0i
-1.0+2.0i; -1.0+2.0i
-2.0i; -2.0i
-1.0i; -1.0i
0; 0
1.0i; 1.0i
2.0i; 2.0i
1.0+-2.0i; 1.0+-2.0i
1.0+-1.0i; 1.0+-1.0i
1.0; 1.0
1.0+1.0i; 1.0+1.0i
1.0+2.0i; 1.0+2.0i
-1.0+-2.0i; -1.0+-2.0i
-1.0+-1.0i; -1.0+-1.0i
-1.0; -1.0
-1.0+1.0i; -1.0+1.0i
-1.0+2.0i; -1.0+2.0i
-2.0i; -2.0i
-1.0i; -1.0i
0; 0
1.0i; 1.0i
2.0i; 2.0i
1.0+-2.0i; 1.0+-2.0i
1.0+-1.0i; 1.0+-1.0i
1.0; 1.0
1.0+1.0i; 1.0+1.0i
1.0+2.0i; 1.0+2.0i
-1.0+-2.0i; -1.0+-2.0i
-1.0+-1.0i; -1.0+-1.0i
-1.0; -1.0
-1.0+1.0i; -1.0+1.0i
-1.0+2.0i; -1.0+2.0i
-2.0i; -2.0i
-1.0i; -1.0i
0; 0
1.0i; 1.0i
2.0i; 2.0i
1.0+-2.0i; 1.0+-2.0i
1.0+-1.0i; 1.0+-1.0i
1.0; 1.0
1.0+1.0i; 1.0+1.0i
1.0+2.0i; 1.0+2.0i
-1.0+-2.0i; -1.0+-2.0i
-1.0+-1.0i; -1.0+-1.0i
-1.0; -1.0
-1.0+1.0i; -1.0+1.0i
-1.0+2.0i; -1.0+2.0i
-2.0i; -2.0i
-1.0i; -1.0i
0; 0
1.0i; 1.0i
2.0i; 2.0i
1.0+-2.0i; 1.0+-2.0i
1.0+-1.0i; 1.0+-1.0i
1.0; 1.0
1.0+1.0i; 1.0+1.0i
1.0+2.0i; 1.0+2.0i
-1.0+-2.0i; -1.0+-2.0i
-1.0+-1.0i; -1.0+-1.0i
-1.0; -1.0
-1.0+1.0i; -1.0+1.0i
-1.0+2.0i; -1.0+2.0i
-2.0i; -2.0i
-1.0i; -1.0i
0; 0
1.0i; 1.0i
2.0i; 2.0i
1.0+-2.0i; 1.0+-2.0i
1.0+-1.0i; 1.0+-1.0i
1.0; 1.0
1.0+1.0i; 1.0+1.0i
1.0+2.0i; 1.0+2.0i
-1.0+-2.0i; -1.0+-2.0i
-1.0+-1.0i; -1.0+-1.0i
-1.0; -1.0
-1.0+1.0i; -1.0+1.0i
-1.0+2.0i; -1.0+2.0i
-2.0i; -2.0i
-1.0i; -1.0i
0; 0
1.0i; 1.0i
2.0i; 2.0i
1.0+-2.0i; 1.0+-2.0i
1.0+-1.0i; 1.0+-1.0i
1.0; 1.0
1.0+1.0i; 1.0+1.0i
1.0+2.0i; 1.0+2.0i
-1.0+-2.0i; -1.0+-2.0i
-1.0+-1.0i; -1.0+-1.0i
-1.0; -1.0
-1.0+1.0i; -1.0+1.0i
-1.0+2.0i; -1.0+2.0i
-2.0i; -2.0i
-1.0i; -1.0i
0; 0
1.0i; 1.0i
2.0i; 2.0i
1.0+-2.0i; 1.0+-2.0i
1.0+-1.0i; 1.0+-1.0i
1.0; 1.0
1.0+1.0i; 1.0+1.0i
1.0+2.0i; 1.0+2.0i
-1.0+-2.0i; -1.0+-2.0i
-1.0+-1.0i; -1.0+-1.0i
-1.0; -1.0
-1.0+1.0i; -1.0+1.0i
-1.0+2.0i; -1.0+2.0i
-2.0i; -2.0i
-1.0i; -1.0i
0; 0
1.0i; 1.0i
2.0i; 2.0i
1.0+-2.0i; 1.0+-2.0i
1.0+-1.0i; 1.0+-1.0i
1.0; 1.0
1.0+1.0i; 1.0+1.0i
1.0+2.0i; 1.0+2.0i

这是我应该得到的：

    -1.0-2.0i; -1.0-2.0i
    -1.0-2.0i; -1.0-1.0i
-1.0-2.0i; -1.0
-1.0-2.0i; -1.0+1.0i
-1.0-2.0i; -1.0+2.0i
-1.0-2.0i; -2.0i
-1.0-2.0i; -1.0i
-1.0-2.0i; 0
-1.0-2.0i; 1.0i
-1.0-2.0i; 2.0i
-1.0-2.0i; 1.0-2.0i
-1.0-2.0i; 1.0-1.0i
-1.0-2.0i; 1.0
-1.0-2.0i; 1.0+1.0i
-1.0-2.0i; 1.0+2.0i
-1.0-1.0i; -1.0-2.0i
-1.0-1.0i; -1.0-1.0i
-1.0-1.0i; -1.0
-1.0-1.0i; -1.0+1.0i
-1.0-1.0i; -1.0+2.0i
-1.0-1.0i; -2.0i
-1.0-1.0i; -1.0i
-1.0-1.0i; 0
-1.0-1.0i; 1.0i
-1.0-1.0i; 2.0i
-1.0-1.0i; 1.0-2.0i
-1.0-1.0i; 1.0-1.0i
-1.0-1.0i; 1.0
-1.0-1.0i; 1.0+1.0i
-1.0-1.0i; 1.0+2.0i
-1.0; -1.0-2.0i
-1.0; -1.0-1.0i
-1.0; -1.0
-1.0; -1.0+1.0i
-1.0; -1.0+2.0i
-1.0; -2.0i
-1.0; -1.0i
-1.0; 0
-1.0; 1.0i
-1.0; 2.0i
-1.0; 1.0-2.0i
-1.0; 1.0-1.0i
-1.0; 1.0
-1.0; 1.0+1.0i
-1.0; 1.0+2.0i
-1.0+1.0i; -1.0-2.0i
-1.0+1.0i; -1.0-1.0i
-1.0+1.0i; -1.0
-1.0+1.0i; -1.0+1.0i
-1.0+1.0i; -1.0+2.0i
-1.0+1.0i; -2.0i
-1.0+1.0i; -1.0i
-1.0+1.0i; 0
-1.0+1.0i; 1.0i
-1.0+1.0i; 2.0i
-1.0+1.0i; 1.0-2.0i
-1.0+1.0i; 1.0-1.0i
-1.0+1.0i; 1.0
-1.0+1.0i; 1.0+1.0i
-1.0+1.0i; 1.0+2.0i
-1.0+2.0i; -1.0-2.0i
-1.0+2.0i; -1.0-1.0i
-1.0+2.0i; -1.0
-1.0+2.0i; -1.0+1.0i
-1.0+2.0i; -1.0+2.0i
-1.0+2.0i; -2.0i
-1.0+2.0i; -1.0i
-1.0+2.0i; 0
-1.0+2.0i; 1.0i
-1.0+2.0i; 2.0i
-1.0+2.0i; 1.0-2.0i
-1.0+2.0i; 1.0-1.0i
-1.0+2.0i; 1.0
-1.0+2.0i; 1.0+1.0i
-1.0+2.0i; 1.0+2.0i
-2.0i; -1.0-2.0i
-2.0i; -1.0-1.0i
-2.0i; -1.0
-2.0i; -1.0+1.0i
-2.0i; -1.0+2.0i
-2.0i; -2.0i
-2.0i; -1.0i
-2.0i; 0
-2.0i; 1.0i
-2.0i; 2.0i
-2.0i; 1.0-2.0i
-2.0i; 1.0-1.0i
-2.0i; 1.0
-2.0i; 1.0+1.0i
-2.0i; 1.0+2.0i
-1.0i; -1.0-2.0i
-1.0i; -1.0-1.0i
-1.0i; -1.0
-1.0i; -1.0+1.0i
-1.0i; -1.0+2.0i
-1.0i; -2.0i
-1.0i; -1.0i
-1.0i; 0
-1.0i; 1.0i
-1.0i; 2.0i
-1.0i; 1.0-2.0i
-1.0i; 1.0-1.0i
-1.0i; 1.0
-1.0i; 1.0+1.0i
-1.0i; 1.0+2.0i
0; -1.0-2.0i
0; -1.0-1.0i
0; -1.0
0; -1.0+1.0i
0; -1.0+2.0i
0; -2.0i
0; -1.0i
0; 0
0; 1.0i0
0; 2.0i
0; 1.0-2.0i
0; 1.0-1.0i
0; 1.0
0; 1.0+1.0i
0; 1.0+2.0i
1.0i; -1.0-2.0i
1.0i; -1.0-1.0i
1.0i; -1.0
1.0i; -1.0+1.0i
1.0i; -1.0+2.0i
1.0i; -2.0i
1.0i; -1.0i
1.0i; 0
1.0i; 1.0i
1.0i; 2.0i
1.0i; 1.0-2.0i
1.0i; 1.0-1.0i
1.0i; 1.0
1.0i; 1.0+1.0i
1.0i; 1.0+2.0i
2.0i; -1.0-2.0i
2.0i; -1.0-1.0i
2.0i; -1.0
2.0i; -1.0+1.0i
2.0i; -1.0+2.0i
2.0i; -2.0i
2.0i; -1.0i
2.0i; 0
2.0i; 1.0i
2.0i; 2.0i
2.0i; 1.0-2.0i
2.0i; 1.0-1.0i
2.0i; 1.0
2.0i; 1.0+1.0i
2.0i; 1.0+2.0i
1.0-2.0i; -1.0-2.0i
1.0-2.0i; -1.0-1.0i
1.0-2.0i; -1.0
1.0-2.0i; -1.0+1.0i
1.0-2.0i; -1.0+2.0i
1.0-2.0i; -2.0i
1.0-2.0i; -1.0i
1.0-2.0i; 0
1.0-2.0i; 1.0i
1.0-2.0i; 2.0i
1.0-2.0i; 1.0-2.0i
1.0-2.0i; 1.0-1.0i
1.0-2.0i; 1.0
1.0-2.0i; 1.0+1.0i
1.0-2.0i; 1.0+2.0i
1.0-1.0i; -1.0-2.0i
1.0-1.0i; -1.0-1.0i
1.0-1.0i; -1.0
1.0-1.0i; -1.0+1.0i
1.0-1.0i; -1.0+2.0i
1.0-1.0i; -2.0i
1.0-1.0i; -1.0i
1.0-1.0i; 0
1.0-1.0i; 1.0i
1.0-1.0i; 2.0i
1.0-1.0i; 1.0-2.0i
1.0-1.0i; 1.0-1.0i
1.0-1.0i; 1.0
1.0-1.0i; 1.0+1.0i
1.0-1.0i; 1.0+2.0i
1.0; -1.0-2.0i
1.0; -1.0-1.0i
1.0; -1.0
1.0; -1.0+1.0i
1.0; -1.0+2.0i
1.0; -2.0i
1.0; -1.0i
1.0; 0
1.0; 1.0i
1.0; 2.0i
1.0; 1.0-2.0i
1.0; 1.0-1.0i
1.0; 1.0
1.0; 1.0+1.0i
1.0; 1.0+2.0i
1.0+1.0i; -1.0-2.0i
1.0+1.0i; -1.0-1.0i
1.0+1.0i; -1.0
1.0+1.0i; -1.0+1.0i
1.0+1.0i; -1.0+2.0i
1.0+1.0i; -2.0i
1.0+1.0i; -1.0i
1.0+1.0i; 0
1.0+1.0i; 1.0i
1.0+1.0i; 2.0i
1.0+1.0i; 1.0-2.0i
1.0+1.0i; 1.0-1.0i
1.0+1.0i; 1.0
1.0+1.0i; 1.0+1.0i
1.0+1.0i; 1.0+2.0i
1.0+2.0i; -1.0-2.0i
1.0+2.0i; -1.0-1.0i
1.0+2.0i; -1.0
1.0+2.0i; -1.0+1.0i
1.0+2.0i; -1.0+2.0i
1.0+2.0i; -2.0i
1.0+2.0i; -1.0i
1.0+2.0i; 0
1.0+2.0i; 1.0i
1.0+2.0i; 2.0i
1.0+2.0i; 1.0-2.0i
1.0+2.0i; 1.0-1.0i
1.0+2.0i; 1.0
1.0+2.0i; 1.0+1.0i
1.0+2.0i; 1.0+2.0i

score 0 · Accepted Answer

我有一种感觉，你在追求这种行为：

for (double i = -a; i<=a; i++){
    for (double j = -b; j<=b; j++){
        complex c1 = new complex (i, j);
        System.out.println(c1);
    }
}
for (double k = -c; k<=c; k++){
    for (double l = -d; l<=d; l++){
        complex c2 = new complex (k, l);
        System.out.println(c2);
    }
}

score 0 · Accepted Answer

为什么当 l 循环还没有完成时 j 和其他变量会发生变化？ 这是因为每次我增加时都会初始化 j,k 和 l。

在这

for (double j = -b; j<=b; j++){
            for (double k = -c; k<=c; k++){
                for (double l = -d; l<=d; l++){

这里 when i=-a then j=-b,k=-c and l=-d now when then i 递增 theni=-a then j=-b,k=-c and l=-d

java - 为什么我的 for 循环在 java 中不能正确递增？

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