如何从 Java 方法返回 2 个值? [英] How to return 2 values from a Java method?

问题描述

我试图从 Java 方法返回 2 个值，但出现这些错误.这是我的代码:

I am trying to return 2 values from a Java method but I get these errors. Here is my code:

// Method code
public static int something(){
    int number1 = 1;
    int number2 = 2;

    return number1, number2;
}

// Main method code
public static void main(String[] args) {
    something();
    System.out.println(number1 + number2);
}

错误:

Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - missing return statement
    at assignment.Main.something(Main.java:86)
    at assignment.Main.main(Main.java:53)

Java 结果:1

推荐答案

与其返回包含两个值的数组或使用通用的 Pair 类，不如考虑创建一个表示结果的类你想返回，并返回该类的一个实例.给班级起一个有意义的名字.与使用数组相比，这种方法的优点是类型安全，并且会使您的程序更易于理解.

Instead of returning an array that contains the two values or using a generic Pair class, consider creating a class that represents the result that you want to return, and return an instance of that class. Give the class a meaningful name. The benefits of this approach over using an array are type safety and it will make your program much easier to understand.

注意:一个通用的 Pair 类，正如这里其他一些答案中所提议的，也为您提供了类型安全，但没有传达结果代表什么.

Note: A generic Pair class, as proposed in some of the other answers here, also gives you type safety, but doesn't convey what the result represents.

示例(不使用真正有意义的名称):

Example (which doesn't use really meaningful names):

final class MyResult {
    private final int first;
    private final int second;

    public MyResult(int first, int second) {
        this.first = first;
        this.second = second;
    }

    public int getFirst() {
        return first;
    }

    public int getSecond() {
        return second;
    }
}

// ...

public static MyResult something() {
    int number1 = 1;
    int number2 = 2;

    return new MyResult(number1, number2);
}

public static void main(String[] args) {
    MyResult result = something();
    System.out.println(result.getFirst() + result.getSecond());
}

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