java字符串匹配问题

Question

I am facing a very basic problem. Some time small things can take your whole day :( but thank to stackoverflow memebers who always try to help :)

I am trying to match 2 strings if they match it should return TRUE

now I am using this

if (var1.indexOf(var2) >= 0) {
return true;
}

But if var1 has value "maintain" and var2 has value "inta" or "ain" etc. it still return true :(. Is there any way in java that can do full text matching not partial? For example

if("mango"=="mango"){
return true;
}

thanks ! ! !

Answer 1

为什么不使用内置的String equals()方法？

return var1.equals(var2);

Answer 2

if( "mango".equals("mango") ) { 
   return true;
}

Be careful not to use == for string comparisons in Java unless you really know what you're doing.

Answer 3

use equals or equalsIgnoreCase on java.util.String for matching strings. You also need to check for null on the object you are comparing, I would generally prefer using commons StringUtils for these purposes. It has very good utils for common string operations.

Answer 4

Here's an example to show why == is not what you want:

String s1 = new String("something");
String s2 = new String("something");
System.out.println(s1 == s2);
System.out.println(s1.equals(s2));

In effect, while s1 and s2 contains the same sequence of characters, they are not referring to the same location in memory. Thus, this prints false and true .