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Extra resources for Java Reference Library 1.3
Sample text
Q refers to the same Button. A change to the object through p... is also visible through q. " This is not true of primitive types, however: int i = 3; int j = i; i = 2; // // // // i contains the value 3. j contains a copy of the value in i. Changing i doesn't change j. Now, i == 2 and j == 3. Terminology: Pass by Reference The statement that Java manipulates objects "by reference" causes confusion for some programmers, because there are several different meanings of "by reference" in common use.
Note that not all types support the clone() method. Only classes that implement the Cloneable interface may be cloned. lang Package. Arrays are also reference types, and assigning an array simply copies a reference to the array. arraycopy() method. Checking Objects for Equality Another implication of passing objects by reference is that the == operator tests whether two variables refer to the same object, not whether two objects contain the same values. To actually test whether two separate objects are the same, you must use a specially written method for that object type (just as you might use strcmp() to compare C strings for equality).
It merely assigns a reference to the object. Consider the following code: Button a = new Button("Okay"); Button b = new Button("Cancel"); a = b; After these lines are executed, the variable a contains a reference to the object that b refers to. The object that a used to refer to is lost. clone(); After these lines run, the variable c refers to an object that is a duplicate of the object referred to by b. Note that not all types support the clone() method. Only classes that implement the Cloneable interface may be cloned.
Java Reference Library 1.3
by John
4.2