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An object is an instance of a class. Object reference is a pointer to the object. There can be many references to the same object.
The java.lang.Class class is used to represent the classes and interfaces that are loaded by a java program.
Object’s of String class is immutable and object’s of String Buffer class is mutable moreover String Buffer is faster in concatenation.
Math class provides methods for mathematical functions.
No. It cannot be instantiated. The class is final and its constructor is private. But all the methods are static, so we can use them without instantiating the Math class.
It simply returns the absolute value of the value supplied to the method, i.e. gives you the same value. If you supply negative value it simply removes the sign.
This method returns always double, which is not less than the supplied value. It returns next available whole number
This method returns always double, which is not greater than the supplied value.
The max () method returns greater value out of the supplied values.
The min () method returns smaller value out of the supplied values.
The random () method returns random number between 0.0 and 1.0. It always returns double.