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J 的代码
j3_29.java
import java.io.*;
class Test{
public static void main(String[] args){
Test t = new Test ();
try{
t.readFile();
}catch(IOException e){
System.out.println(e);
System.out.prin
j3_26.java
import java.util.*;
class TestIterator {
public static void main(String[] args) {
ArrayList h = new ArrayList();
h.add("1st");
h.add("2nd");
h.add(new Integer(3));
h.add(new Double(4
j3_38.java
class TestThread2 {
public static void main(String args[]) {
Runner2 r = new Runner2();
Thread t1 = new Thread(r);
Thread t2 = new Thread(r);
t1.start();
t2.start();
}
}
class Run
j3_35.java
import java.net.*;
import java.io.*;
class TestServer {
public static void main(String args[]) {
try {
ServerSocket s = new ServerSocket(8888);
while (true) {
Socket s1 = s.accep
j3_17.java
class Person {
private int id;
private static int total = 0;
public static int getTotalPerson() {
return total;
}
public Person() {
total++;
id = total;
}
}
class TestPerson {
j3_20.java
interface Runner {
public void run();
}
interface Swimmer {
public double swim();
}
abstract class Animal {
abstract public int eat();
}
class Person extends Animal implements Runner,Swimm
j3_37.java
class TestThread1 {
public static void main(String args[]) {
Runner1 r = new Runner1();
Thread t = new Thread(r);
t.start();
}
}
class Runner1 implements Runnable {
public void run()
j3_21.java
import java.util.*;
class Test
{
public static void main(String args[])
{
String names[] = {"Mercury","Venus","Earth","Mars"};
int namesLen = names.length;
Vector planets = new Vector()
j3_09.java
class InstanceOfDemo {
public static void main (String args []) {
InstanceOfDemo t = new InstanceOfDemo( );
if (t instanceof InstanceOfDemo) {
System.out.println ("T是InstanceOfDemo 的实例")
j3_34.java
import java.io.*;
import java.net.*;
class URLReader{
public static void main(String args[]){
try{
URL tirc = new URL("http://www.tsinghua.edu.cn/");
BufferedReader in = new BufferedRea