如何使用tostring方法打印两个私有字符串变量 [英] How do I use a tostring method to print two private string variables

问题描述

我需要使用toString方法打印出两个String变量，而我尝试过它将无法打印出来并且不会编译。



我尝试过：

i need to print out two String variables using the toString method, and what ive tried it won't print out right and it wont compile.

What I have tried:

public String toString(){
         this.dayOfTheWeek = day;
         this.name = n;
         String day = new String("The name of the show is: " + n + "and airs on: " + day);
         System.out.println(day.toString());

推荐答案

我害怕这都错了。变量 day 和 n 在 toString 中不存在方法。它们应该在构造函数中设置：

This is all wrong I'm afraid. The variables day and n do not exist in the toString method. They should be set either in the constructor:

class ThisClass {
    private int dayOfTheWeek;
    private String name;

    ThisClass(int day, String name) {
         this.dayOfTheWeek = day;
         this.name = name;
    }

或使用setter（参见添加Setter和Getter方法 - Java EE 6教程 [ ^ ]）。



此外，您不应该在 toString中打印数据方法。其目的是返回一个可由调用者打印的字符串。所以你的方法应该是这样的：

or by using setters (see Adding Setter and Getter Methods - The Java EE 6 Tutorial[^]).

Also you should not be printing the data in the toString method. Its purpose is to return a string which may be printed by the caller. So Your method should look like:

public String toString(){
    String textday = new String("The name of the show is: " + n + "and airs on: " + day);
    return textday;
}

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