最好的方法在Java Boolean对象转换为字符串 [英] Best approach to converting Boolean object to string in java

问题描述

我想布尔值转换为字符串类型...

I am trying to convert boolean to string type...

Boolean b = true;
String str = String.valueOf(b);

或

Boolean b = true;
String str = Boolean.toString(b);

其中大于1会更有效？

which one of above would be more efficient?

推荐答案

我不认为会有他们之间的任何显著的性能差异，但我会preFER一号路。

I don't think there would be any significant performance difference between them, but I would prefer the 1st way.

如果你有一个布尔参考， Boolean.toString（布尔）将抛出 NullPointerException异常如果您参考空。作为基准的拆箱到布尔传递给方法之前。

If you have a Boolean reference, Boolean.toString(boolean) will throw NullPointerException if your reference is null. As the reference is unboxed to boolean before being passed to the method.

在将String.valueOf（）法作为源$ C ​​$ C表示，不明确的空检查：

While, String.valueOf() method as the source code shows, does the explicit null check:

public static String valueOf(Object obj) {
    return (obj == null) ? "null" : obj.toString();
}

只是测试这个code：

Just test this code:

Boolean b = null;

System.out.println(String.valueOf(b));    // Prints null
System.out.println(Boolean.toString(b));  // Throws NPE

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有关原始布尔，没有任何区别。

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For primitive boolean, there is no difference.

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