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public class j3_04 { public static void main (String args []) { boolean b = true; //声明boolean型变量并赋值 int x, y=8; // 声明int型变量 float f = 4.5f; // 声明float型变量并赋值

import java.util.*; class Test { public static void main(String args[]) { String names[] = {"beijing","shanghai","nanchang","sichuan"}; String person[] = {"北方","南部沿海","中部","西部"}; Hashta

class MyClass { private int day; private int month; private int year; public MyClass(){ day = 1; month = 1; year = 1900; } public MyClass(int d,int m,int y){ day = d; month

public class j3_06{ public static void main(String argv[]){ int a[]= new int[5]; System.out.println(a[3]); } }

import java.io.*; class WriteFile { public static void main (String[] args) { File file = new File("tt.txt"); try { InputStreamReader is = new InputStreamReader (System.in); Buffered

import java.awt.Graphics; import java.applet.Applet; public class j3_02 extends Applet { String hw_text ; public void init () { hw_text = "Hello World"; } public void paint(Graphics g) {

import java.net.*; import java.io.*; class TestClient { public static void main(String args[]) { try { Socket s1 = new Socket("127.0.0.1", 8888); InputStream is = s1.getInputStream();

class A{ int value = 3; int getValue(){return value;} } class B extends A{ int value = 6; int getValue() {return value;} int getValue2(){return super.value;} int getValue3(){return getValu

public class j3_01 { public static void main (String args[]) { System.out.println("Hello World!"); } }

import java.io.*; class Test{ public static void main (String args[]) { String s; // 创建一个BufferedReader对象从键盘逐行读入数据 InputStreamReader isr = new InputStreamReader (System.in); BufferedRea