Question

我编写了以下Java代码，并想询问如果用户输入距离＆lt; 0？我是否每次都必须创建一个新变量，或者只有当Distance＆gt; = 0时才能循环整个过程和getInt？非常感谢。

public  class   W05Practical {
public  static  void    main(String []  args)   {
    System.out.println("Please enter the lengths/distance in meters:");
    int Distance = EasyIn.getInt();

    if (Distance >= 0) {
System.out.println("Thank you");
    }
    else { 
System.out.println("Distance can not be negative. \nPlease enter the appropriate distance:");
    }   
}
}

Answer 1

这是我对这个问题的建议。创建一个名为correctInput的布尔值，并让它监视它是否是正确的输入。

例如：

public  class   W05Practical {
    public  static  void   main(String[] args){
        boolean correctInput = false;

        while(!correctInput){
            System.out.println("Please enter the lengths/distance in meters:");
            int Distance = EasyIn.getInt();

            if (Distance >= 0) {
                System.out.println("Thank you");
                correctInput = true;
            }else { 
                System.out.println("Distance can not be negative. \nPlease enter the appropriate distance:");
            }  
        }    
    }
}

用户EasyIn的复杂条件表达式。

1 个答案: