在switch语句中将值从一个case传递到另一个case [英] Passing a value from one case to another in switch statement

问题描述

所以这是一个示例代码：

So here is a sample code :

import java.util.Scanner;

public class Test {

public static void main(String[] args) {
    System.out.println("Please type in a number");
    Scanner in = new Scanner(System.in);
    switch (in.nextInt()){
        case 1:
            save(in);
            break;
        case 2:
            System.out.println(value);
            break;
        default:
            System.out.println("Default case");
            break;
    }               
    in.close();
}

public static String save(Scanner in){
System.out.println("Type in a word");
String value = in.next();
return value;
}
}

在这种特殊情况下我想在这里做的一切是访问存储在案例1中的值。

In this particular situation all I am trying to do here is to have access to the value that was stored in case 1.

推荐答案

切换所有类似c语言的语句，包括java都非常通用。它根据switch变量的值跳转到标签，然后继续，直到出现 break 语句。

switch statement in all c-like languages including java is very general. It jumps to label according to the value of switch variable and then continues until break statement appears.

我不是确定你在长篇解释中的意思如下：

I am not sure what did you meant in your long explanation but in following example:

switch(op) {
    case ONE:
        foo();
    case TWO:
        bar();
        break;
    case THREE:
        aaa();
        qqq();
        break;
}

op == ONE 将调用第一个方法 foo（），然后流将到达 TWO 的块，因为没有break语句是用 ONE 编写，所以将调用 bar（）。但是，break语句会将流程跳转到切换后出现的代码。

op == ONE first method foo() will be called, then the flow will arrive to block of TWO because no break statement was written in ONE, so bar() will be called. However then the break statement will jump the flow to code that appears just after the switch.

这是一个简短的解释。有关详细信息，请查找好的书籍或教程，并阅读有关switch语句的章节。

This is a short explanation. For more details find a good book or tutorial and read chapter about switch statement.

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