1.1assertions may be used to validate the input parameters of a private method. This is because, private methods are called only by the developer of the class. Therefore, if a private method is called with an invalid parameter, this problem should be rectified at the development stage itself. It cannot occur in the production stage, so there is no need to throw an explicit exception.
If the boolean expression is false, a java.lang.AssertionError is thrown.
AssertionError extends from java.lang.Error.
The second operand can be null
but it cannot be void. In the above case, if value is not 10, it will throw new
AssertionError(null).
1.2 assert <boolean_expression> : <any_expression_but_void>;
1.3 Each enable or disable modifies the one before it. This allows you to
enable assertions in general, but disable them in a particular package:
java -ea -da:<package>... myPackage.myProgram
2.break cannot be used outside of a loop or a switch
3.continue cannot be used outside of a loop(continue can be used only inside a 'for', 'while' or 'do while' loop.)
4 int x;
// while (false) { x=3;System.out.println(x); } //Unreachable code
if (false) { x=3; System.out.println(x); }
for( int i = 0; i< 0; i++) x = 3 ;
// for( int i = 0; false; i++) x = 3; //Unreachable code