Systems

Systems  The System class holds a collection of static methods and variables. The standard input, output, and error output of the Java run time are stored in the in, out, and err variables. The methods defined by System are shown .Notice that many of the methods...

Memory Management

Memory Management Although Java provides automatic garbage collection, sometimes you will want to know how large the object heap is and how much of it is left. You can use this information, for example, to check your code for efficiency or to approximate how many more...

Boolean

Boolean Boolean is a very thin wrapper. around Boolean values, which is useful mostly when You want to pass a Boolean variable by reference. It contains the constants TRUE and ‘ FALSE, which define true and false Boolean objects. Boolean also defines the...

Character

Character  Character is a simple wrapper around a char. The constructor for Character is Character(char ell) Here, ch specifies the character that will be wrapped by the Character object being created. . To obtain the char value contained in a Character object, call...

Converting Numbers to and from Strings

Converting Numbers to and from Strings One of the most common programming’ chores is converting the string representation of a number into its internal, binary format. Fortunately, Java provides an easy way’ to accomplish this. The Byte, Short, Integer,...

Understanding is infinite( ) and is NaN( )

Understanding is infinite( ) and is NaN( ) Float and Double provide the methods is infinite ) and is NaN( ), which help when manipulating two special double and float values. These methods test for two unique values defined by the EERIE floating-point specification:...