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Java Class Q&A » Wrapper Class » operator 

1. Wrapper class and == operator    stackoverflow.com

Integer integer1 = 127;
Integer integer2 = 127;
System.out.println(integer1 == integer2);//true

integer1 = 128;
integer2 = 128;
System.out.println(integer1 == integer2);//false
I found it returns == (if it is) under the rage of -128 - 127 , why ...

2. '==' operators with Wrapper class    coderanch.com

When you use Strings and have two Strings which are compile time constants, the JVM uses the same String objectString s1 = "Campbell"; String s2 = "Campbell"; System.out.printf("s1 == s2: %b%n", s1 == s2);Try that, and you find the two references point to the same String object. When you use some wrapper objects, something rather similar happens. It happens for Integers; ...

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