什么是更好的？ if..else或多个简单if [英] What is better? if..else or multiple simple if

问题描述

谈论java性能..什么更好？ if..else或multiple simple if

  if（condition）{
 some_code; 
返回值; 
} 
 else if（condition）{
 some_code; 
返回值; 
} 
 else if（condition）{
 some_code; 
返回值; 
} 
 else {
 some_code; 
返回值; 
} 
  

或

  if（condition）{
 some_code; 
返回值; 
} 
 
 if（condition）{
 some_code; 
返回值; 
} 
 
 if（condition）{
 some_code; 
返回值; 
} 
 
 some_code; 
返回值; 
  

对您的想法感兴趣

Thnx！

解决方案

性能方面没有区别。选择最易读的选项，可能取决于代码的作用。

一般不要担心这些微优化。只有在您确定存在需要修复的性能问题后才能进行优化。

我们应该忘记效率低，大约97％的时间说：过早优化是所有邪恶的根源。 — Donald Knuth

talking about java performance .. what is better? if..else or multiple simple if

if( condition ) {
  some_code;
  return value;
}
else if( condition ) {
  some_code;
  return value;
}
else if( condition ) {
  some_code;
  return value;
}
else {
  some_code;
  return value;
}

or

if( condition ) {
  some_code;
  return value;
}

if( condition ) {
  some_code;
  return value;
}

if( condition ) {
  some_code;
  return value;
}

some_code;    
return value;

Interested in your thoughts

Thnx !

解决方案

There is no difference, performance-wise. Choose the most readable option, which could be either depending on what the code does.

In general do not worry about these micro-optimizations. Optimization should only come after you've determined there is a performance problem that needs to be fixed.

"We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil." —Donald Knuth

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