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1¡¢Çëд³öÏÂÃæ³ÌÐòµÄÔËÐнá¹û¡£ package com.gem.j2SE03; abstract class A { private int x = 100; public A(){ this.print(); }

public abstract void print(); }

class B extends A { private int x = 200; public B(int x){ this.x = x; }

public void print(){

System.out.println(\ } }

public class TestJava { private void mian() { A a = new B(20); } }

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2¡¢Çëд³öÏÂÃæ³ÌÐòµÄÔËÐнá¹û¡£ public class Test extends TT{ public void main(String args[]){ Test t = new Test(\ }

public Test(String s){ super(s);

System.out.println(\ }

public Test(){ this(\ } }

class TT{ public TT(){

System.out.println(\ }

public TT(String s){ this();

System.out.println(\ } }

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3¡¢ÔĶÁÏÂÁгÌÐò£¬Ð´³ö³ÌÐòÔËÐеĽá¹û£º public class Test {

public static void main (String[] args) {

String s1=new String(\ String s2=\ String s3=\

System.out.println(s1==s2);

System.out.println(s1.equals(s2)); System.out.println(s2==s3);

System.out.println(s2.equals(s3)); String s4=s1;

System.out.println(s1==s4);

System.out.println(s1.equals(s4)); } }

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4¡¢public class Test {

private static void printArray(int[] arr) { for(int i=0;i< arr.length;i++) System.out.print(arr[i]+\ System.out.println(\ }

private static void changeValue(int value) { value*=2; }

private static void changeValue(int[] arr) { for(int i=0;i

public static void main (String[] args) { int[] arr={1,2,3,4,5}; changeValue(arr[0]); printArray(arr); changeValue(arr); printArray(arr); } }

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5¡¢class MyException extends Exception { public MyException(String message) { super(message); } }

public class Test {

private static void fun1() throws MyException {

throw new MyException(\in fun1().\ }

private static void fun2() throws MyException { try { fun1(); }

catch(NullPointerException ex) { System.out.println(\¡¢\ }

finally {

System.out.println(\ } }

public static void main (String[] args) { try {

fun2(); }

catch(MyException ex) {

System.out.println(\); }

catch(Exception ex) {

System.out.println(\ } } }

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6¡¢ÏÂÃæÊÇÒ»¸öÀàµÄ¶¨Ò壬ÇëÍê³É³ÌÐòÌî¿Õ¡£ public class ___ _______ {

int x, y;

Myclass ( int £¬ int ) // ¹¹Ôì·½·¨ {

x=i; y=j; } }

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7¡¢ ÏÂÃæÊÇÒ»¸öÀàµÄ¶¨Ò壬Ç뽫Æä²¹³äÍêÕû¡£ class ___ __ { String name; int age;

Student( ___ __ s, int i) { name=s; age=i; } }

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8¡¢ÏÂÃæ³ÌÐòµÄ¹¦ÄÜÊÇͨ¹ýµ÷Ó÷½·¨max£¨£©Çó¸ø¶¨µÄÈý¸öÊýµÄ×î´óÖµ£¬Ç뽫Æä²¹³äÍêÕû¡£ public class Class1{

public static void main( String args[] ){ int i1=1234,i2=456,i3=-987;

System.out.println(\Èý¸öÊýµÄ×î´óÖµ¡¢\ ); }

public static int max(int x,int y,int z) { int temp1,max_value; temp1=x>y?x:y;

max_value=temp1>z?temp1:z; return max_value; } }

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9¡¢Ð´³öÏÂÁгÌÐòµÄÊä³ö½á¹û public class Test{

public static void main(String[] args){ Count myCount = new Count(); int times = 0;

for(int i=0;i<100;i++)

increment(myCount , times);

System.out.println(¡°count is¡± + myCount.count); System.out.println(¡°time is¡±+ times); }

public static void increment(Count c , int times){ c.count++; times++; } }

class Count{

public int count; Count(int c){ count =c; }

Count(){ count =1; } }

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10¡¢ÔĶÁÏÂÁгÌÐò£¬Ð´³ö³ÌÐòÔËÐеĽá¹û£º class Circle { double radius;

public Circle(double r){ this.radius=r; } }

public class Test{

public static void main(String[] args){ Circle circle1 = new Circle(1); Circle circle2 = new Circle(2);

System.out.println(\swap:circle1 =\ swap(circle1,circle2); System.out.println(\swap:circle1 = \ }

public static void swap(Circle x , Circle y){

System.out.println(\swap: x = \ y = \

Circle temp = x; x = y; y = temp;

System.out.println(\ x = \= \ } }

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11¡¢ÏÂÁгÌÐòµÄÊä³ö½á¹ûÊÇʲô£¿ public class Foo{ static int i=0; static int j=0;

public static void main(String[] args){ int i=2; int k=3; int j=3;

System.out.println(¡°i + j is ¡±+ i + j); k = i +j;

System.out.println(¡°k is ¡±+k); System.out.println(¡°j is ¡±+ j); } }

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12¡¢ÔËÐÐÀàCµÄÊä³ö½á¹ûÊÇʲô£¿ class A{

public A(){

System.out.println(\default constructor of A y is

invoked\} }

class B extends A{ public B(){

System.out.println(\default constructor of B is invoked\ } }

public class C{

public static void main(String[] args){ B b = new B(); } }

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13¡¢ÔĶÁÏÂÁгÌÐòд³öÊä³ö½á¹û: class A{

String s=\ void show(){

System.out.println(s); } }

class B extends A{

String s=\

void show() {

System.out.println(s); } }

public class TypeConvert{

public static void main(String args[]){ B b1;

B b2=new B();

A a1,a2; a1=(A)b2; a2=b2;

System.out.println(a1.s); a1.show();

System.out.println(a2.s); a2.show(); b1=(B)a1;

System.out.println(b1.s); b1.show();

System.out.println(b2.s); b2.show(); } }

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14¡¢ÔĶÁÏÂÁгÌÐò£¬Ð´³ö³ÌÐòÔËÐеĽá¹û£º class A { int i, j;

public A(){ this.i=0; this.j=0; }

public void print(){ System.out.println (\}

class B extends A{ int m;

public B (int i, int j, int m){ super (); this.m=m; }

public void print (){System.out.println (\ m=\}

public class C{

public static void main(String args[]){ A a=new A();

B b=new B(1, 2, 3); a.print (); b.print (); } }}

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15¡¢ÔĶÁÏÂÁгÌÐò£¬Ð´³ö³ÌÐòÔËÐеĽá¹û£º class Demo { public void test ()

{System.out.println (\public void test (int i) {System.out.println (i);} public void test (int a, int b) {System.out.println (a+b);} }

public class Test {

public static void main(String args[]){ Demo de=new Demo(); de.test(); de.test(5); de.test(6,8); } }

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16¡¢ÔĶÁÏÂÁгÌÐò£¬Ð´³ö³ÌÐòÔËÐеĽá¹û£º class Cube{ int width; int height; int depth;

Cube(int x,int y,int z){ this.width=x; this.height=y; this.depth=z; }

public int vol(){

return width*height*depth;}} public class UseCube {

public static void main(String[] args) { Cube a=new Cube(3,4,5);

System.out.println(\³¤¶È=\ System.out.println(\Ìå»ý=\ } }

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17¡¢ÔĶÁÏÂÁгÌÐò£¬Ð´³ö³ÌÐòÔËÐеĽá¹û£º class SuperClass{ int x=10; int y=20;

public void show(){

System.out.println(\ÎÒÊǸ¸ÀàµÄ³ÉÔ±·½·¨£¡\}

class SubClass extends SuperClass{ int z=30; }

public class JC {

public static void main(String[] args) { SuperClass father=new SuperClass(); SubClass child=new SubClass();

System.out.println(\¸¸ÀàSuperClass³ÉÔ±±äÁ¿¡¢\

System.out.println(\×ÓÀàSubClass³ÉÔ±±äÁ¿¡¢\ } }

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18¡¢ÔĶÁÏÂÁгÌÐò£¬Ð´³ö³ÌÐòÔËÐеĽá¹û£º public class Class431 {

public static void main(String[] args) { int a = 3; char m='a';

prt(\ prt(\

prt(\ prt(\ }

static float test1(char x, int y) { int z = x+y; return z; }

static float test2() { int a = 60;

for (int i = 8; i < 12; i++) a= a+i;

prt(\ return a; }

static void prt(String s) { System.out.println(s); } }

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19¡¢ÔĶÁÏÂÁгÌÐò£¬Ð´³ö³ÌÐòÔËÐеĽá¹û£º public class Class432 { static int i=123;

public static void main (String[] args) { int i=456;

System.out.println(\ÖÐµÄ i=\ m1( ); m2( ); }

static void m1( ) { int i=789;

System.out.println(\ÖÐµÄ i=\ }

static void m2( ) {

System.out.println(\Àà±äÁ¿ i=\ i+=6;

System.out.println(\¼Ó 6 ºóµÄÀà±äÁ¿ i=\ } }

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20¡¢ÏÂÃæ³ÌÐòµÄ½á¹ûÊÇʲô£¿ class Tester { int var;

Tester(double var) {

this.var = (int)var; }

Tester(int var) { this(\ }

Tester(String s) { this();

System.out.println(s); }

Tester(){

System.out.println(\ }

public static void main(String[] args) Tester t = new Tester(5); } }

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21¡¢ÒÔÏ´úÂëµÄÔËÐнá¹ûÊÇ class Base{ int i; Base(){ add(1);

System.out.println(i); }

void add(int v){ i+=v;

System.out.println(i); }

void print(){

System.out.println(i); } }

class MyBase extends Base{ MyBase(){ add(2); }

{ void add(int v){ i+=v*2;

System.out.println(i); } }

public class TestClu {

public static void main(String[] args) { go(new MyBase()); //System.out.println(); }

static void go(Base b){ b.add(8); //b.print(); } }

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22¡¢ÒÔÏ´úÂëµÄÊä³ö½á¹ûÊÇÏÂÁÐÄĸöÑ¡Ï class Base{Base(){

System.out.println(\ } }

public class Checket extends Base{ Checket(){

System.out.println(\ super(); }

public static void main(String argv[]){ Checket c = new Checket(); // super(); } }

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23¡¢¸ø¶¨ÏÂÃæµÄ´úÂ룬ÄĸöÑ¡ÏîÔÚÌæ´ú\ºó¿ÉÒÔ±»±àÒë²¢ÇҸıä±äÁ¿oakµÄÖµ£¿

class Base{

static int oak=99; }

public class Doverdale extends Base{

public static void main(String argv[]){ Doverdale d = new Doverdale(); d.amethod(); }

public void amethod(){ //Here } }

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