Exploring Java.lang Package

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This web page focuses on the following

• String Class
• Math Class
• Wrapper Classes

String Class
Once a string object is created it can never be changed, string objects are immutable objects. String objects are create using the new keyword, the String class has many constructors.

String example 
String s = new String();
s = "Using the new keyword";
String s = new String("Using a one liner");
String s = "Using the shorthand version";  more...