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This method is discussed in connection with garbage collection (see Section 94, p 396) It is called on an object just before it is garbage collected, so that any cleaning up can be done However, the default finalize() method in the Object class does not do anything useful
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In addition, the Object class provides support for thread communication in synchronized code, through the following methods, which are discussed in Section 136 on page 634:
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final final final final final void void void void void wait(long timeout) throws InterruptedException wait(long timeout, int nanos) throws InterruptedException wait() throws InterruptedException notify() notifyAll()
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A thread invokes these methods on the object whose lock it holds A thread waits for notification by another thread
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Example 101 Methods in the Object class class MyClass implements Cloneable { public Object clone() { Object obj = null; try { obj = superclone();} // Calls overridden method catch (CloneNotSupportedException e) { Systemoutprintln(e);} return obj; } } //______________________________________________________________________________ public class ObjectMethods { public static void main(String[] args) { // Two objects of MyClass MyClass obj1 = new MyClass(); MyClass obj2 = new MyClass(); // Two strings String str1 = new String("WhoAmI"); String str2 = new String("WhoAmI"); // Method hashCode() overridden in String class // Strings that are equal have the same hash code Systemoutprintln("hash code for str1: " + str1hashCode()); Systemoutprintln("hash code for str2: " + str2hashCode() + "\n"); // Hash codes are different for different MyClass objects Systemoutprintln("hash code for MyClass obj1: " + obj1hashCode()); Systemoutprintln("hash code for MyClass obj2: " + obj2hashCode()+"\n"); // Method equals() overridden in the String class Systemoutprintln("str1equals(str2): " + str1equals(str2)); Systemoutprintln("str1 == str2: " + (str1 == str2) + "\n"); // Method equals() from the Object class called Systemoutprintln("obj1equals(obj2): " + obj1equals(obj2)); Systemoutprintln("obj1 == obj2: " + (obj1 == obj2) + "\n");
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102: THE Object CLASS // The runtime object that represents the class of an object Class rtStringClass = str1getClass(); Class rtMyClassClass = obj1getClass(); // The name of the class represented by the runtime object Systemoutprintln("Class for str1: " + rtStringClass); Systemoutprintln("Class for obj1: " + rtMyClassClass + "\n"); // The toString() method is overridden in the String class String textRepStr = str1toString(); String textRepObj = obj1toString(); Systemoutprintln("Text representation of str1: " + textRepStr); Systemoutprintln("Text representation of obj1: " + textRepObj + "\n"); // Shallow copying of arrays MyClass[] array1 = {new MyClass(), new MyClass(), new MyClass()}; MyClass[] array2 = array1clone(); // Array objects are different, but share the element objects Systemoutprintln("array1 == array2: " + (array1 == array2)); for(int i = 0; i < array1length; i++) { Systemoutprintln("array1[" + i + "] == array2[" + i + "] : " + (array1[i] == array2[i])); } Systemoutprintln(); // Clone an object of MyClass MyClass obj3 = (MyClass) obj1clone(); // Cast required Systemoutprintln("hash code for MyClass obj3: " + obj3hashCode()); Systemoutprintln("obj1 == obj3: " + (obj1 == obj3)); } }
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Output from the program:
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hash code for str1: -1704812257 hash code for str2: -1704812257 hash code for MyClass obj1: 25669322 hash code for MyClass obj2: 14978587 str1equals(str2): true str1 == str2: false obj1equals(obj2): false obj1 == obj2: false Class for str1: class javalangString Class for obj1: class MyClass Text representation of str1: WhoAmI Text representation of obj1: MyClass@187aeca array1 == array1[0] array1[1] array1[2] array2: false == array2[0] : true == array2[1] : true == array2[2] : true
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428 hash code for MyClass obj3: 19770577 obj1 == obj3: false
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101 What is the return type of the hashCode() method in the Object class Select the one correct answer (a) String (b) int (c) long (d) Object (e) Class 102 Which statement is true Select the one correct answer (a) If the references x and y denote two different objects, the expression xequals(y) is always false (b) If the references x and y denote two different objects, the expression (xhashCode() == yhashCode()) is always false (c) The hashCode() method in the Object class is declared final (d) The equals() method in the Object class is declared final (e) All arrays have a method named clone 103 Which exception can the clone() method of the Object class throw Select the one correct answer (a) CloneNotSupportedException (b) NotCloneableException (c) IllegalCloneException (d) NoClonesAllowedException
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