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int num1=10£» int num2¶þ20£»

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public static void main (String args [] ) { Test t=new Test(); if (t==null) (

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A. 0 B. null C. NoObject D. ±àÒë³ö´í

10£®¸ø¶¨ÈçÏ´úÂ룺 class Circle{

String name, radius; int r;

public Circle (String n) name=n; }

public Circle (String n,int a){ name=n; r=a; )

public Circle (String n,String d, int a){ radius=d; }

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}

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public class Rectangle {//doing something'..} B. import java.io.*; package mypackage;

public class Rectangle {//doing something'\C. import java.io.*;

class Circle{//doing something\

public class Rectangle {//doing something...} D. import java.io.*; import java.awt.*;

public class Rectangle {//doing something...}

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private static int Val; public int getVal(){ return val; } }

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3. class MyClass{

4. //do something 5. }

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public int i=0;

public static void method(){

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public static int i=0;

public static void method(){ System.out.println (i); ) }

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}

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1. public class Test{ 2. short mValue;

3. public static void main(String[] args){ 4. int a=32; 5. int b=56;

6. Test os=new Test (a+b); 7. os.Show (); 8. }

9. protected Test (short aValue) { 10. mValue= aValue; 11. }

12. public void Show() {

13. System. out .println (mValue); 14. } 15. }

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1 public class Test{

2 public static void main (String argv [ ] ) { 3 Bird b=new Bird(); 4 b. fly (3); 5 } 6 }

7 class Bird{

8. static int Type=2;

9. private void fly(int an_Type) { 10. Type= an_Type;

11. System. out .println (\12. } 13. }

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StaticTest () { y++; }

public static void main (String args [] ) { StaticTest st=new StaticTest (); System.out.println (\

System. out.println (\ st=new StaticTest ();

System.out.println (\ System. out.println (\}

static { x++; }

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public class PassTest{ float ptValue;

public void changeInt(int value){ value=il; }

public void changeStr(String value){ value=new String(\ }

public void changeObjValue( PassTest ref){ ref.ptValue=22; }

public static void main(String args[ ] ){ String str; int val;

PassTest pt=new PassTest(); val=33;

pt.changeInt (val);

System.out.println(\ str=new String (\ pt.changeStr (str);

System. out.println(\ pt.ptValue=44;

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} }

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class Test {

public static String ss=\º¼Öݵç×ӿƼ¼´ó\ public String ms= \¼ÆËã»úѧԺ\ public void printInfo () {

System. out.println (\ }

public static void main (String [] args) { Test obj1, obj2; obj1=new Test(); obj2=new Test();

obj1.ss=\Õã½­¹¤Òµ´óѧ\obj1.ms= \Èí¼þѧԺ\obj1.printInfo(); obj2.printInfo(); } }

6£®ÔĶÁÒÔϳÌÐò£¬»Ø´ðÎÊÌâ¡£ package packagel; class ClassA{

public void printInfo(){

System.out.println (\ } }

package package2;

import packagel.ClassA; public class ClassB{

public static voidmain(String [] args){ new ClassA().printInfo(); } }

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7£®ÔĶÁÏÂÃæ³ÌÐò£¬Ð޸ijÌÐòÖдíÎóµÄµØ·½(Ìáʾ£º¹²Èý´¦)¡£ 1. class Person{ 2. String name; 3. int age; 4. String sex;

5. public Person(String name,int age,String sex){ 6. this.name=name; 7. this.age=age; 8. this.sex=sex; 9. }

10. public void toString(){

11. return \12. } 13. }

14. public class TestPerson{

15. public static void main(String args[]){ 16. Person p=new Person(); 17. p.name=\ÕÅÈý\18. p.age=20; 19. p.sex=\ÄÐ\

20. System. out.println (Person.tostring ()); 21. } 22. }

8£®Ð´³öÏÂÁгÌÐò´úÂëµÄÔËÐнá¹û¡£ public class Test( int x=4;

public static void main (String argv [ ] ) { Test t=new Test (); t.x++;

change (t);

System.out.println (t.x); }

static void change (Test m) { m.x+=2; } }

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