java3_three - 10 ███████████ 10 G ª...

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Unformatted text preview: 10 ███████████ 10 G ª Powered by http://www.jabook.org 3 rd Edition since 2001 10 0 Object 0 10.1 Object 10.1.1 0 ▣ S “ ; ◈ vL ¸ “ ; Object X 6C ; ( O ) G5 ª ; . ▣ ; x ºª* ◈ 'import java.lang.*' ; t B import O . ◈ 'extends Object' } ?r – x– . ▣ Object ù ◈ , & 7 r @ – – ◈ " OE¼ h « ! † ð© †E `© ▣ Object P ù ◈ boolean equals(Object obj) ◈ String toString() ◈ int hashCode() ◈ protected void finalize() ◈ protected Object clone() ◈ final void notify(), final void notifyAll() ◈ final void wait(), final void wait(long timeout), final void wait(long timeout, int nanos) ◈ final Class getClass() ▣ Object ◈ public class Data { ◈ // X6C ; ◈ } ▣ Object ◈ public class DataObject extends Object { ◈ // X6C ; ◈ } final vL ; final –x– 17 h B O , G5 ª ; final – – 17 h + & G I ; . final y ; … ³ B X U C ; . 10.1.2 0 toString() ▣ “ ; ³0 ◈ S “ ; (Type) ◈ “ ; ▣ & p toString() , È ºª ◈ System.out.println(t); ◈ System.out.println(t.toString()); ▣ O toString() ◈ class Toy extends Object{ ◈ // O ◈ } ◈ public class ToStringMain{ ◈ public static void main(String args){ ◈ Toy t = new Toy(); ◈ System.out.println( t ); ◈ System.out.println( t.toString() ); ◈ } ◈ } 10.1.3 toString() S ▣ toString() 3 ; w ◈ class EBook { ◈ private int id; ◈ private String name; ◈ public EBook(int id, String name) { ◈ this.id = id; ◈ this.name = name; ◈ } ◈ public String toString() { //toString() 0 ◈ return name + " " + id; ◈ } ◈ } ◈ public class ToStringMain2 { ◈ public static void main(String args) { ◈ EBook e1 = new EBook(1000, " R ; "); ◈ EBook e2 = new EBook(2000, " "); ◈ System.out.println("e1: " + e1 ); // ◈ System.out.println("e2: " + e2 ); // ◈ System.out.println("e1.toString(): " + e1.toString() ); ◈ System.out.println("e2.toString(): " + e2.toString() ); ◈ } ◈ } ▣ toString() j ◈ i b R – ! – 5 Q M r c . ◈ i b & ª R – ! O . 10.1.4 , toString() ▣ toString() _ Date 0 ◈ Date d = new Date(); ◈ System.out.println( d ); ◈ System.out.println( d.toString() ); ▣ String toString() ◈ “ w 6 , 8 r & ªE – . ▣ X ¸ “ * Date 0 toString() ◈ import java.util.Date; ◈ public class DateMain{ ◈ public static void main(String args) { ◈ System.out.println( new Date() ); ◈ System.out.println( new Date().toString() ); ◈ } ◈ } 10.1.5 0 equals() ▣ equals() 0 == V t ; « ³ . ◈ class Apple{ ◈ //... GJC ; ◈ } ◈ Apple a1 = new Apple(); ◈ Apple a2 = new Apple(); ◈ a1 == a2; // O false( ; ) ◈ a1.equals(a2); // O false ▣ O ◈ == } z V – x equals() – ‡ 3 ? ▣ equals() █ ◈ equals() ....
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This note was uploaded on 11/06/2010 for the course CS 2050 taught by Professor Uhlmann during the Fall '09 term at Missouri (Mizzou).

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java3_three - 10 ███████████ 10 G ª...

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