Initial Values of Variables in Java

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4125 Initial Values of Variables
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TYPES, VALUES, AND VARIABLES
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For type short, the default value is zero, that is, the value of (short)0 For type int, the default value is zero, that is, 0 For type long, the default value is zero, that is, 0L For type float, the default value is positive zero, that is, 00f For type double, the default value is positive zero, that is, 00d For type char, the default value is the null character, that is, '\u0000'
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For all reference types ( 43), the default value is null
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Each method parameter ( 841) is initialized to the corresponding argument value provided by the invoker of the method ( 1512)
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Each constructor parameter ( 881) is initialized to the corresponding argument value provided by a class instance creation expression ( 159) or explicit constructor invocation ( 887)
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A local variable ( 144, 1414) must be explicitly given a value before it is used, by either initialization ( 144) or assignment ( 1526), in a way that can be veri ed by the compiler using the rules for de nite assignment ( 16) The example program:
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class Point { static int npoints; int x, y; Point root; }
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class Test { public static void main(String[] args) { Systemoutprintln("npoints=" + Pointnpoints); Point p = new Point(); Systemoutprintln("px=" + px + ", py=" + py); Systemoutprintln("proot=" + proot); } } npoints=0 px=0, py=0 proot=null
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An exception-handler parameter ( 1420) is initialized to the thrown object representing the exception ( 113, 1418)
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For type boolean, the default value is false
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illustrating the default initialization of npoints, which occurs when the class Point is prepared ( 1232), and the default initialization of x, y, and root, which occurs when a new Point is instantiated See 12 for a full description of all aspects of loading, linking, and initialization of classes and interfaces, plus a description of the instantiation of classes to make new class instances 4126 Types, Classes, and Interfaces In the Java programming language, every variable and every expression has a type that can be determined at compile time The type may be a primitive type or a reference type Reference types include class types and interface types Reference types are introduced by type declarations, which include class declarations ( 81) and interface declarations ( 91) We often use the term type to refer to either a class or an interface Every object belongs to some particular class: the class that was mentioned in the creation expression that produced the object, the class whose Class object was used to invoke a re ective method to produce the object, or the String class for objects implicitly created by the string concatenation operator + ( 15181) This class is called the class of the object (Arrays also have a class, as described at the end of this section) An object is said to be an instance of its class and of all superclasses of its class Sometimes a variable or expression is said to have a run-time type This refers to the class of the object referred to by the value of the variable or expression at run time, assuming that the value is not null The compile time type of a variable is always declared, and the compile time type of an expression can be deduced at compile time The compile time type limits the possible values that the variable can hold or the expression can produce at run time If a run-time value is a reference that is not null, it refers to an object or array that has a class, and that class will necessarily be compatible with the compile-time type Even though a variable or expression may have a compile-time type that is an interface type, there are no instances of interfaces A variable or expression whose type is an interface type can reference any object whose class implements ( 815) that interface Here is an example of creating new objects and of the distinction between the type of a variable and the class of an object:
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public interface Colorable { void setColor(byte r, byte g, byte b); } class Point { int x, y; } class ColoredPoint extends Point implements Colorable {
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