字符串到布尔值转换的最佳性能 [英] Best performance for string to boolean conversion

问题描述

从下面的选项中将String转换为boolean时具有最佳性能。

Which has best performance while converting String to boolean from the below options.

1. boolean value = new Boolean （true）。booleanValue（）;


2. boolean value = Boolean.valueOf（true）;


3. boolean value = Boolean.parseBoolean（true）;

1. boolean value = new Boolean("true").booleanValue();
2. boolean value = Boolean.valueOf("true");
3. boolean value = Boolean.parseBoolean("true");

推荐答案

boolean value = new Boolean("true").booleanValue();

最差，创建新的布尔对象全部时间。 BTW booleanValue（）是没有必要的，拆箱将为你做。

Worst, creates new Boolean objects all the time. BTW booleanValue() is not necessary, unboxing will do it for you.

boolean value = Boolean.valueOf("true");

好多了，使用缓存布尔实例，但是执行不必要的（虽然很便宜）拆箱。

Much better, uses cached Boolean instance, but performs unnecessary (although very cheap) unboxing.

boolean value = Boolean.parseBoolean("true");

最好，什么都不浪费，几乎不用于原语，不涉及内存分配。 BTW所有人都委托给（Sun / Oracle）：

Best, nothing is wasted, operates barely on primitives, no memory allocations involved. BTW all of them delegate to (Sun/Oracle):

private static boolean toBoolean(String name) { 
  return ((name != null) && name.equalsIgnoreCase("true"));
}

如果你是偏执狂，你可以创建自己的 toBoolean （字符串名称）不忽略大小写 - 可以忽略不计：

If you are paranoid you can create your own toBoolean(String name) not ignoring case - negligibly faster:

boolean value = "true".equals(yourString);

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