Java Tips

• The Default value of uninitialized int variable is Zero.
• Border layout or grid layout affected by the frame size this case with not apply flow layout.
• When a class is properly encapsulated it is possible to change the class  implementation with out chnge it interface.
• Implementation change do not affect other class which aside by this interface.
• The Abstract Keywords must precede the method return type.
• A Java package is a naming context for classes and & Interface.
• A compilation unit is a java source code file.
• Package name or statement appear as the first line in a source code file.
• java.lang package is always imported by default.return type of a main method is void
• argument of main method is always string type.