在Java中<-是什么? [英] What is <-- in Java?

问题描述

我在下面的代码段中遇到了.它输出到4 3 2 1

I came across below snippet. It outputs to 4 3 2 1

我从没遇到过Java中的<--.

I never came across <-- in Java.

<--是将var1的值设为var2的运算符吗?

Is <-- an operator that makes the value of var1 to var2?

public class Test {

    public static void main(String[] args) {

        int var1 = 5, var2 = 0;
        while (var2 <-- var1) {
            System.out.print(" " + var1);
        }
    }
}

推荐答案

<--不是新的Java运算符(即使看起来像这样)，但是有2种常规运算符:<和--

<-- is not a new Java operator (even though it may look like it), but there are 2 normal operators: < and --

while (var2 <-- var1)与while(var2 < (--var1))相同，可以将其翻译为普通英语:

while (var2 <-- var1) is the same as while(var2 < (--var1)), which can be translated to plain english as:

1. 减少var1变量(--var是前缀减少，即在条件验证之前减少变量)
2. 验证条件var2 < var1

1. decrement the var1 variable ( --var is a prefix decrementation, ie. decrement the variable before condition validation)
2. Validate the condition var2 < var1

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