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class other than Object, then this constructor will begin with an explicit or implicit invocation of a superclass constructor (using super) Evaluate the arguments and process that superclass constructor invocation recursively using these same ve steps If that constructor invocation completes abruptly, then this procedure completes abruptly for the same reason Otherwise, continue with step 4 4 Execute the instance initializers and instance variable initializers for this class, assigning the values of instance variable initializers to the corresponding instance variables, in the left-to-right order in which they appear textually in the source code for the class If execution of any of these initializers results in an exception, then no further initializers are processed and this procedure completes abruptly with that same exception Otherwise, continue with step 5 (In some early implementations, the compiler incorrectly omitted the code to initialize a eld if the eld initializer expression was a constant expression whose value was equal to the default initialization value for its type) 5 Execute the rest of the body of this constructor If that execution completes abruptly, then this procedure completes abruptly for the same reason Otherwise, this procedure completes normally In the example:
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class Point { int x, y; Point() { x = 1; y = 1; } }
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class ColoredPoint extends Point { int color = 0xFF00FF; }
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class Test { public static void main(String[] args) { ColoredPoint cp = new ColoredPoint(); Systemoutprintln(cpcolor); } }
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a new instance of ColoredPoint is created First, space is allocated for the new ColoredPoint, to hold the elds x, y, and color All these elds are then initialized to their default values (in this case, 0 for each eld) Next, the ColoredPoint constructor with no arguments is rst invoked Since ColoredPoint declares no constructors, a default constructor of the form:
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ColoredPoint() { super(); }
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is provided for it automatically by the Java compiler
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This constructor then invokes the Point constructor with no arguments The Point constructor does not begin with an invocation of a constructor, so the compiler provides an implicit invocation of its superclass constructor of no arguments, as though it had been written:
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Point() { super(); x = 1; y = 1; }
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Object() { }
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class Super { Super() { printThree(); } void printThree() { Systemoutprintln("three"); } } class Test extends Super { int three = (int)MathPI; // That is, 3 public static void main(String[] args) { Test t = new Test(); tprintThree(); } void printThree() { Systemoutprintln(three); }
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This constructor executes without effect and returns Next, all initializers for the instance variables of class Point are executed As it happens, the declarations of x and y do not provide any initialization expressions, so no action is required for this step of the example Then the body of the Point constructor is executed, setting x to 1 and y to 1 Next, the initializers for the instance variables of class ColoredPoint are executed This step assigns the value 0xFF00FF to color Finally, the rest of the body of the ColoredPoint constructor is executed (the part after the invocation of super); there happen to be no statements in the rest of the body, so no further action is required and initialization is complete Unlike C++, the Java programming language does not specify altered rules for method dispatch during the creation of a new class instance If methods are invoked that are overridden in subclasses in the object being initialized, then these overriding methods are used, even before the new object is completely initialized Thus, compiling and running the example:
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Therefore, the constructor for Object which takes no arguments is invoked The class Object has no superclass, so the recursion terminates here Next, any instance initializers, instance variable initializers of Object are invoked Next, the body of the constructor of Object that takes no arguments is executed No such constructor is declared in Object, so the compiler supplies a default one, which in this special case is:
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