问题

当源代码如下所示时：

```java
void run() { 
  while (true) {
    if (a > 0) {
    } else {
        return;
    }
  }
}

“else”块中有“return”，但当写下“break;”时，它也能正常工作。所以我想更深入地了解为什么在这里使用“return;”是更好的代码。

<details>
<summary>英文:</summary>

When have the source code like this:

```java
void run() { 
  while (true) {
    if (a &gt; 0) {
    } else {
        return;
    }
  }
}

The "else" block has return, but when write down "break;", it also works the same.
So I wonder a little more deep reason why using "return;" is more good code here.

答案1

得分: 4

In this case it works because break exits the loop and goes to the end of the method which immediately returns. Which is functionally equivalent to returning immediately.

但在这种情况下，例如

void run(){ 
  while(true){
    if(a > 0){
    }else{return;}
  }
  System.out.println("Hello");
}

与

void run(){ 
  while(true){
    if(a > 0){
    }else{break;}
  }
  System.out.println("Hello");
}

第一个版本不会打印，而第二个会。

void run(){ 
  while(true){
    if(a>0){
    }else{return;}
  }
  System.out.println("Hello");
}

void run(){ 
  while(true){
    if(a>0){
    }else{break;}
  }
  System.out.println("Hello");
}