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class Child extends Parent { void printMe() {
System.out.println(\ }
void printall() { super.printMe(); this.printMe(); printMe(); } }
public class Test_this {
public static void main(String args[]) { Child myC=new Child(); myC.printall(); } }
A¡¢parent child child B¡¢parent child parent C¡¢parent child D¡¢±àÒë´íÎó
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17.ÔÚ±àдJava applet³ÌÐòʱ£¬ÈôÐèÒª¶Ô·¢Éúʼþ×÷³öÏìÓ¦ºÍ´¦Àí£¬Ò»°ãÐèÒªÔÚ³ÌÐòµÄ ¿ªÍ·Ð´ÉÏ____Óï¾ä¡£ £¨D £© A¡¢import java.awt.*; B¡¢import java.applet.*; C¡¢import java.io.*; D¡¢import java.awt.event.*;
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19.java.io°üÖж¨ÒåÁ˶à¸öÁ÷ÀàÐÍÀ´ÊµÏÖÊäÈëºÍÊä³ö¹¦ÄÜ£¬¿ÉÒÔ´Ó²»Í¬µÄ½Ç¶È¶ÔÆä½øÐзÖÀà,°´¹¦ÄÜ·ÖΪ£º£¨A¡¢ÊäÈëÁ÷ºÍÊä³öÁ÷ £¨·½Ïò£© B¡¢×Ö½ÚÁ÷ºÍ×Ö·ûÁ÷ £¨ÄÚÈÝ£© C¡¢½ÚµãÁ÷ºÍ´¦ÀíÁ÷ £¨·Ö¹¤£© 20. ÒÔϳÌÐòµÄÔËÐнá¹ûΪ£¨ B £© public class IfTest{
public static void main(String args[]){ int x=3; int y=1; if(x==y)
System.out.println(\else
System.out.println(\} }
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Apple increament(){ i++; return this; }
void print(){
System.out.println(\ }
public static void main(String[] args) { Apple redapple=new Apple(1000);
redapple.increament().increament().print(); } i=1002 2. ÏÂÁгÌÐòµÄÊä³ö½á¹ûΪ£º class SuperClass{
private int n; SuperClass(){
System.out.println(\ }
SuperClass(int n){
System.out.println(\ } }
class SubClass extends SuperClass{
private int n; SubClass(int n){ super();
System.out.println(\ this.n=n; }
SubClass(){
super(300);
System.out.println(\ } }
public class TestSuperSub {
public static void main(String args[]){ SubClass sc=new SubClass(400); }
} ½á¹û£ºSuperClass() SubClass(400)
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public int value; public void f(){
value=100;
System.out.println(\ } }
class ChildClass extends FatherClass{ public int value; public void f(){
super.f(); value=200;
System.out.println(\ System.out.println(value); System.out.println(super.value); } }
public class TestInherit {
public static void main(String[] args) { ChildClass cc=new ChildClass(); cc.f(); }
} FatherClass.value=100 ChildClass value=200 200 100 ËÄ¡¢³ÌÐòÉè¼Æ£¨Ã¿Ìâ10·Ö£¬¹²30·Ö£©
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