java StringBuffer equals 方法是否比较内容？
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Does the StringBuffer equals method compare content?
提问by rocker
Possible Duplicate:
Comparing StringBuffer content with equals
StringBuffer s1= new StringBuffer("Test");
StringBuffer s2 = new StringBuffer("Test");
if(s1.equals(s2)) {
System.out.println("True");
} else {
System.out.println("False");
}
Why does that code print "False"?
为什么该代码打印“假”？
回答by Michael Krauklis
StringBufferdoes not override the Object.equalsmethod, so it is not performing a string comparison. Instead it is performing a direct object comparison. Your conditional may as well be if(s1==s2). If you want to compare the strings you'll need to turn the buffers into strings first.
StringBuffer不会覆盖Object.equals方法，因此它不会执行字符串比较。相反，它正在执行直接对象比较。您的条件也可能是 if(s1==s2)。如果要比较字符串，则需要先将缓冲区转换为字符串。
See http://java.sun.com/j2se/1.5.0/docs/api/java/lang/StringBuffer.html
见http://java.sun.com/j2se/1.5.0/docs/api/java/lang/StringBuffer.html
Edit: I'm assuming we're in a java world.
编辑：我假设我们在 Java 世界中。
p.s. If you're in a single-threaded environment, or your buffers are isolated to a single thread, you should really be using a StringBuilderinstead of a StringBuffer.
ps 如果您处于单线程环境中，或者您的缓冲区与单个线程隔离，那么您确实应该使用StringBuilder而不是StringBuffer。
回答by duffymo
StringBuffer equals isn't overridden to check content. It's using the default "shallow equals" that compares references it inherits from java.lang.Object.
StringBuffer equals 不会被覆盖以检查内容。它使用默认的“浅等于”来比较它从 java.lang.Object 继承的引用。
