java - 菜鸟需要帮助如何退出我的 Java 程序

Question

我不明白我应该如何让这个程序停止。基本上它要我做的是当我输入 -1 时程序关闭。我只是想不通怎么办。哦!瑞典语中的“sida”是边的意思。不知道有没有用!有你们这里的一些帮助会很棒!

import java.util.Scanner;
public class triangle
{

//Triangle is going up
public static void triangelUpp(int sida)
{

    for(int i = 0; i <= sida; i++)
    {
        for(int j = 1; j <= i; j++)
        System.out.print("*");
        System.out.println();
    }       
}


//Triangle going down
public static void triangelNed(int sida)
{

    for(int i = 0; i <= sida; i++)
    {
        for(int j = 1; j <= sida - i; j++)
        System.out.print("*");
        System.out.println();
    }       
}


public static void main(String[] args)
{

    //Variables 
    Scanner keyboard = new Scanner(System.in);
    int vinkel = 0;
    int sida = 0;


    //Rules
    while(sida !=-1)
    {
        if(vinkel == 0)
            triangelNed(sida);

        else if(vinkel == 1)
            triangelUpp(sida);

    System.out.println("Write the length of the triangle and end with -1");
    sida = keyboard.nextInt();

    System.out.println("Is the angle going to be up(1) or down?(0)");
    vinkel = keyboard.nextInt();

    }

}

}

Answer 1

最简单的方法:更改 while-loop至 while(true)然后在分配 sida 之后:if (sida < 0) { break; }

换句话说:

while(true) {
    //some logic here...
    sida = keyboard.nextInt();
    //if (sida < 0) {
    //since you don't like the regular approach, changing it to fit your odd needs
    if (sida == -1) {
        //breaks the while loop
        break;
    }
    //rest of code...
}

使用 System.exit(0)将终止进程，显示示例

while(true) {
    //code here...
    //same here
    //if (sida < 0) {
    if (sida == -1) {
        //comment/uncomment the options to see the program behavior
        //using this, the message after the while loop will be printed
        break;
        //using this, the message after the while loop won't be printed
        //System.exit(0);
    }
}
System.out.println("Thanks! See ya later");