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int num1=10£» int num2¶þ20£»
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public int stuff(String s£¬int x£¬int y) ÒÔÏÂÄĸöÊÇÕýÈ·µÄ·½·¨µ÷ÓÃ?( )
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public static void main (String args [] ) { Test t=new Test(); if (t==null) (
System.out .println (\ } else{
System.out .println (t.value); } } }
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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A. Circle(n,a); B. this(Circle(n,a)); C. this(n,a); D. this(name,a);
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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 int Val; public int getVal(){ return Val; } }
B. class MyClass{
private static int Val; public int getVal(){ return val; } }
C. class MyClass{
private int Va!;
public static iht getVal(){ return Val; } }
D. class MyClass{
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private static int member=l; public static int getMember(){ return member; } };
A. myClass.member B. new myClass().member C. myClass.getMember() D. myClass().getMember()
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A£®String args[] B£®String[] args C£®String a[] D£®String args
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3. class MyClass{
4. //do something 5. }
A. public class MainClass{ } B. package mypackage1; C. class B{ } D. import java. util.*;
24£®ÒÔϳÌÐò´úÂ룬ÎÞ·¨Í¨¹ý±àÒëµÄÊÇ( )¡£ A. class A{
int i=O;
public void method(){
System.out.println (i); } }
B. class A{
int i=0; }
class B{
public void method(){
System.out.println (A.i); } }
C. class A{
public int i=0;
public static void method(){
System. out.println (newA() .i); } }
D. class A{
public static int i=0;
public static void method(){ System.out.println (i); ) }
25£®ÏÂÁдúÂëÔÚ±àÒëʱ»á·¢Éú´íÎó£¬ÏÂÃæÄÄÖÖÐ޸ĿÉÒÔ¸üÕý´íÎó?( ) class Test {
private int m;
public static void fun(){ System.out.println(m); }
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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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3£®×ÐϸÔĶÁÏÂÃæµÄ³ÌÐò´úÂ룬Èô¾±àÒëºÍÔËÐкó£¬Çëд³ö´òÓ¡½á¹û¡£ class StaticTest { static int x=l; int y;
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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pt.changeObjValue(pt);
System.out.println(\£»
} }
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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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