java線程的經(jīng)典代碼

package threadgroup;

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class ThreadDemo3 extends Thread {

private String name;

private int delay;

public ThreadDemo3(String sname, int i_delay) {

name = sname;

delay = i_delay;

}

public void run() {

try {

sleep(delay);

} catch (InterruptedException e) {

}

System.out.println("多線程測試！\n" + name + "\n" + delay);

}

}

public class testMyThread {

public static void main(String[] args) {

ThreadDemo3 th1,th2,th3;

th1 = new ThreadDemo3("線程1", (int) (Math.random() * 900));

th2 = new ThreadDemo3("線程2", (int) (Math.random() * 900));

th3 = new ThreadDemo3("線程3", (int) (Math.random() * 900));

th1.start();

th2.start();

th3.start();

}

}

package threadgroup;

public class threadDemo {

public static void main(String[] args) {

Thread t = Thread.currentThread();

t.setName("你好嗎？");

System.out.println("正在進(jìn)行的Thread是：" + t);

try {

for (int i = 0; i 5; i++) {

System.out.println("我不叫穆繼超" + i);

Thread.sleep(3000);

}

} catch (Exception e) {

// TODO: handle exception

System.out.println("Thread has wrong" + e.getMessage());

}

}

}

package threadgroup;

public class threadDemo2 implements Runnable {

public threadDemo2() {

Thread t1 = Thread.currentThread();

t1.setName("第一個(gè)主進(jìn)程");

System.out.println("正在運(yùn)行" + t1);

Thread t2 = new Thread(this, "");

System.out.println("在創(chuàng)建一個(gè)進(jìn)程");

t2.start();

try {

System.out.println("使他進(jìn)入第一個(gè)睡眠狀態(tài)");

Thread.sleep(2000);

} catch (InterruptedException e) {

System.out.println("Thread has wrong" + e.getMessage());

}

System.out.println("退出第一個(gè)進(jìn)程");

}

public void run() {

try {

for (int i = 0; i 5; i++) {

System.out.println("進(jìn)程" + i);

Thread.sleep(3000);

}

} catch (InterruptedException e) {

// TODO: handle exception

System.out.println("Thread has wrong" + e.getMessage());

}

System.out.println("退出第二個(gè)進(jìn)程");

}

public static void main(String[] args) {

new threadDemo2();

}

}

有什么io方面的java經(jīng)典代碼

package IO;

import java.io.*;

public class FileDirectoryDemo {

public static void main(String[] args) {

// 如果沒有指定參數(shù)，則缺省為當(dāng)前目錄。

if (args.length == 0) {

args = new String[] { "." };

}

try {

// 新建指定目錄的File對象。

File currentPath = new File(args[0]);

// 在指定目錄新建temp目錄的File對象。

File tempPath = new File(currentPath, "temp");

// 用“tempPath”對象在指定目錄下創(chuàng)建temp目錄。

tempPath.mkdir();

// 在temp目錄下創(chuàng)建兩個(gè)文件。

File temp1 = new File(tempPath, "temp1.txt");

temp1.createNewFile();

File temp2 = new File(tempPath, "temp2.txt");

temp2.createNewFile();

// 遞歸顯示指定目錄的內(nèi)容。

System.out.println("顯示指定目錄的內(nèi)容");

listSubDir(currentPath);

// 更改文件名“temp1.txt”為“temp.txt”。

File temp1new = new File(tempPath, "temp.txt");

temp1.renameTo(temp1new);

// 遞歸顯示temp子目錄的內(nèi)容。

System.out.println("更改文件名后，顯示temp子目錄的內(nèi)容");

listSubDir(tempPath);

// 刪除文件“temp2.txt”。

temp2.delete();

// 遞歸顯示temp子目錄的內(nèi)容。

System.out.println("刪除文件后，顯示temp子目錄的內(nèi)容");

listSubDir(tempPath);

} catch (IOException e) {

System.err.println("IOException");

}

}

// 遞歸顯示指定目錄的內(nèi)容。

static void listSubDir(File currentPath) {

// 取得指定目錄的內(nèi)容列表。

String[] fileNames = currentPath.list();

try {

for (int i = 0; i fileNames.length; i++) {

File f = new File(currentPath.getPath(), fileNames[i]);

// 如果是目錄，則顯示目錄名后，遞歸調(diào)用，顯示子目錄的內(nèi)容。

if (f.isDirectory()) {

// 以規(guī)范的路徑格式顯示目錄。

System.out.println(f.getCanonicalPath());

// 遞歸調(diào)用，顯示子目錄。

listSubDir(f);

}

// 如果是文件，則顯示文件名，不包含路徑信息。

else {

System.out.println(f.getName());

}

}

} catch (IOException e) {

System.err.println("IOException");

}

}

}

package IO;

import java.io.*;

public class FileExample {

public FileExample() {

super();

}

public static void main(String[] args) {

try {

String outfile = "demoout.xml";

String infile = "demoin.xml";

/**

* 用FileOutputStream定義一個(gè)輸入流文件，然后用BuferedOutputStream調(diào)用FileOutputStream對象生成一個(gè)緩沖輸出流

然后用DataOutputStream調(diào)用BuferedOutputStream對象生成數(shù)據(jù)格式化輸出流

*/

DataOutputStream dt=new DataOutputStream(new BufferedOutputStream(new FileOutputStream(outfile)));

BufferedWriter NewFile = new BufferedWriter(new OutputStreamWriter(dt, "GBK"));

// 對中文的處理

// 定義一個(gè)輸入流

DataInputStream rafFile1 = new DataInputStream(new BufferedInputStream(new FileInputStream(infile)));

// 定義一個(gè)輸入緩沖

BufferedReader rafFile = new BufferedReader(new InputStreamReader(rafFile1, "GBK"));

String xmlcontent = "";

char tag = 0;// 文件友字符0結(jié)束

while (tag != (char) (-1)) {

xmlcontent = xmlcontent + tag + rafFile.readLine() + '\n';

tag = (char) rafFile.read();

}

NewFile.write(xmlcontent);

NewFile.flush();

NewFile.close();

rafFile.close();

System.gc();

} catch (NullPointerException exc) {

exc.printStackTrace();

} catch (java.lang.IndexOutOfBoundsException outb) {

System.out.println(outb.getMessage());

outb.printStackTrace();

} catch (FileNotFoundException fex) {

System.out.println("fex" + fex.getMessage());

} catch (IOException iex) {

System.out.println("iex" + iex.getMessage());

}

}

}

package IO;

import java.io.*;

public class FileRandomRW {

// 需要輸入的person數(shù)目。

public static int NUMBER = 3;

public static void main(String[] args) {

Persons[] people = new Persons[NUMBER];

people[0] = new Persons("張峰", 26, 2000, "N");

people[1] = new Persons("艷娜", 25, 50000, "Y");

people[2] = new Persons("李朋", 50, 7000, "F");

try {

DataOutputStream out = new DataOutputStream(new FileOutputStream(

"peoplerandom.dat"));

// 將人員數(shù)據(jù)保存至“peoplerandom.dat”二進(jìn)制文件中。

writeData(people, out);

// 關(guān)閉流。

out.close();

// 從二進(jìn)制文件“peoplerandom.dat”中逆序讀取數(shù)據(jù)。

RandomAccessFile inOut = new RandomAccessFile("peoplerandom.dat",

"rw");

Persons[] inPeople = readDataReverse(inOut);

// 輸出讀入的數(shù)據(jù)。

System.out.println("原始數(shù)據(jù)：");

for (int i = 0; i inPeople.length; i++) {

System.out.println(inPeople[i]);

}

// 修改文件的第三條記錄。

inPeople[2].setSalary(4500);

// 將修改結(jié)果寫入文件。

inPeople[2].writeData(inOut, 3);

// 關(guān)閉流。

inOut.close();

// 從文件中讀入的第三條記錄，并輸出，以驗(yàn)證修改結(jié)果。

RandomAccessFile in = new RandomAccessFile("peoplerandom.dat", "r");

Persons in3People = new Persons();

// 隨機(jī)讀第三條記錄。

in3People.readData(in, 3);

// 關(guān)閉流。

in.close();

System.out.println("修改后的記錄");

System.out.println(in3People);

} catch (IOException exception) {

System.err.println("IOException");

}

}

// 將數(shù)據(jù)寫入輸出流。

static void writeData(Persons[] p, DataOutputStream out) throws IOException {

for (int i = 0; i p.length; i++) {

p[i].writeData(out);

}

}

// 將數(shù)據(jù)從輸入流中逆序讀出。

static Persons[] readDataReverse(RandomAccessFile in) throws IOException {

// 獲得記錄數(shù)目。

int record_num = (int) (in.length() / Persons.RECORD_LENGTH);

Persons[] p = new Persons[record_num];

// 逆序讀取。

for (int i = record_num - 1; i = 0; i--) {

p[i] = new Persons();

// 文件定位。

in.seek(i * Persons.RECORD_LENGTH);

p[i].readData(in, i + 1);

}

return p;

}

}

class Persons {

private String name;

private int age; // 4個(gè)字節(jié)

private double salary; // 8個(gè)字節(jié)

private String married;

public static final int NAME_LENGTH = 20; // 姓名長度

public static final int MARRIED_LENGTH = 2; // 婚否長度

public static final int RECORD_LENGTH = NAME_LENGTH * 2 + 4 + 8

+ MARRIED_LENGTH * 2;

public Persons() {

}

public Persons(String n, int a, double s) {

name = n;

age = a;

salary = s;

married = "F";

}

public Persons(String n, int a, double s, String m) {

name = n;

age = a;

salary = s;

married = m;

}

public String getName() {

return name;

}

public int getAge() {

return age;

}

public double getSalary() {

return salary;

}

public String getMarried() {

return married;

}

public String setName(String n) {

name = n;

return name;

}

public int setAge(int a) {

age = a;

return age;

}

public double setSalary(double s) {

salary = s;

return salary;

}

public String setMarried(String m) {

married = m;

return married;

}

// 設(shè)置輸出格式。

public String toString() {

return getClass().getName() + "[name=" + name + ",age=" + age

+ ",salary=" + salary + ",married=" + married + "]";

}

// 寫入一條固定長度的記錄，即一個(gè)人的數(shù)據(jù)到輸出流。

public void writeData(DataOutput out) throws IOException {

FixStringIO.writeFixString(name, NAME_LENGTH, out);

out.writeInt(age);

out.writeDouble(salary);

FixStringIO.writeFixString(married, MARRIED_LENGTH, out);

}

// 寫入一條固定長度的記錄到隨機(jī)讀取文件中。

private void writeData(RandomAccessFile out) throws IOException {

FixStringIO.writeFixString(name, NAME_LENGTH, out);

out.writeInt(age);

out.writeDouble(salary);

FixStringIO.writeFixString(married, MARRIED_LENGTH, out);

}

// 隨機(jī)寫入一條固定長度的記錄到輸出流的指定位置。

public void writeData(RandomAccessFile out, int n) throws IOException {

out.seek((n - 1) * RECORD_LENGTH);

writeData(out);

}

// 從輸入流隨機(jī)讀入一條記錄，即一個(gè)人的數(shù)據(jù)。

private void readData(RandomAccessFile in) throws IOException {

name = FixStringIO.readFixString(NAME_LENGTH, in);

age = in.readInt();

salary = in.readDouble();

married = FixStringIO.readFixString(MARRIED_LENGTH, in);

}

// 從輸入流隨機(jī)讀入指定位置的記錄。

public void readData(RandomAccessFile in, int n) throws IOException {

in.seek((n - 1) * RECORD_LENGTH);

readData(in);

}

}

// 對固定長度字符串從文件讀出、寫入文件

class FixStringIO {

// 讀取固定長度的Unicode字符串。

public static String readFixString(int size, DataInput in)

throws IOException {

StringBuffer b = new StringBuffer(size);

int i = 0;

boolean more = true;

while (more i size) {

char ch = in.readChar();

i++;

if (ch == 0) {

more = false;

} else {

b.append(ch);

}

}

// 跳過剩余的字節(jié)。

in.skipBytes(2 * (size - i));

return b.toString();

}

// 寫入固定長度的Unicode字符串。

public static void writeFixString(String s, int size, DataOutput out)

throws IOException {

int i;

for (i = 0; i size; i++) {

char ch = 0;

if (i s.length()) {

ch = s.charAt(i);

}

out.writeChar(ch);

}

}

}

package IO;

import java.io.*;

import java.util.*;

public class FileRW {

// 需要輸入的person數(shù)目。

public static int NUMBER = 3;

public static void main(String[] args) {

Person[] people = new Person[NUMBER];

// 暫時(shí)容納輸入數(shù)據(jù)的臨時(shí)字符串?dāng)?shù)組。

String[] field = new String[4];

// 初始化field數(shù)組。

for (int i = 0; i 4; i++) {

field[i] = "";

}

// IO操作必須捕獲IO異常。

try {

// 用于對field數(shù)組進(jìn)行增加控制。

int fieldcount = 0;

// 先使用System.in構(gòu)造InputStreamReader，再構(gòu)造BufferedReader。

BufferedReader stdin = new BufferedReader(new InputStreamReader(

System.in));

for (int i = 0; i NUMBER; i++) {

fieldcount = 0;

System.out.println("The number " + (i + 1) + " person");

System.out

.println("Enter name,age,salary,married(optional),please separate fields by ':'");

// 讀取一行。

String personstr = stdin.readLine();

// 設(shè)置分隔符。

StringTokenizer st = new StringTokenizer(personstr, ":");

// 判斷是否還有分隔符可用。

while (st.hasMoreTokens()) {

field[fieldcount] = st.nextToken();

fieldcount++;

}

// 如果輸入married，則field[3]不為空，調(diào)用具有四個(gè)參數(shù)的Person構(gòu)造函數(shù)。

if (field[3] != "") {

people[i] = new Person(field[0],

Integer.parseInt(field[1]), Double

.parseDouble(field[2]), field[3]);

// 置field[3]為空，以備下次輸入使用。

field[3] = "";

}

// 如果未輸入married，則field[3]為空，調(diào)用具有三個(gè)參數(shù)的Person構(gòu)造函數(shù)。

else {

people[i] = new Person(field[0],

Integer.parseInt(field[1]), Double

.parseDouble(field[2]));

}

}

// 將輸入的數(shù)據(jù)保存至“people.dat”文本文件中。

PrintWriter out = new PrintWriter(new BufferedWriter(

new FileWriter("people.dat")));

writeData(people, out);

// 關(guān)閉流。

out.close();

// 從文件“people.dat”讀取數(shù)據(jù)。

BufferedReader in = new BufferedReader(new FileReader("people.dat"));

Person[] inPeople = readData(in);

// 關(guān)閉流。

in.close();

// 輸出從文件中讀入的數(shù)據(jù)。

for (int i = 0; i inPeople.length; i++) {

System.out.println(inPeople[i]);

}

} catch (IOException exception) {

System.err.println("IOException");

}

}

// 將所有數(shù)據(jù)寫入輸出流。

static void writeData(Person[] p, PrintWriter out) throws IOException {

// 寫入記錄條數(shù)，即人數(shù)。

out.println(p.length);

for (int i = 0; i p.length; i++) {

p[i].writeData(out);

}

}

// 將所有數(shù)據(jù)從輸入流中讀出。

static Person[] readData(BufferedReader in) throws IOException {

// 獲取記錄條數(shù)，即人數(shù)。

int n = Integer.parseInt(in.readLine());

Person[] p = new Person[n];

for (int i = 0; i n; i++) {

p[i] = new Person();

p[i].readData(in);

}

return p;

}

}

class Person {

private String name;

private int age;

private double salary;

private String married;

public Person() {

}

public Person(String n, int a, double s) {

name = n;

age = a;

salary = s;

married = "F";

}

public Person(String n, int a, double s, String m) {

name = n;

age = a;

salary = s;

married = m;

}

public String getName() {

return name;

}

public int getAge() {

return age;

}

public double getSalary() {

return salary;

}

public String getMarried() {

return married;

}

// 設(shè)置輸出格式。

public String toString() {

return getClass().getName() + "[name=" + name + ",age=" + age

+ ",salary=" + salary + ",married=" + married + "]";

}

// 寫入一條記錄，即一個(gè)人的數(shù)據(jù)到輸出流。

public void writeData(PrintWriter out) throws IOException {

// 格式化輸出。

out.println(name + ":" + age + ":" + salary + ":" + married);

}

// 從輸入流讀入一條記錄，即一個(gè)人的數(shù)據(jù)。

public void readData(BufferedReader in) throws IOException {

String s = in.readLine();

StringTokenizer t = new StringTokenizer(s, ":");

name = t.nextToken();

age = Integer.parseInt(t.nextToken());

salary = Double.parseDouble(t.nextToken());

married = t.nextToken();

}

}

package IO;

import java.io.*;

public class IOStreamExample {

public static void main(String[] args) throws IOException {

// 1. 讀入一行數(shù)據(jù):

BufferedReader in = new BufferedReader(new FileReader(

"FileStdRead.java"));

String s, s2 = new String();

while ((s = in.readLine()) != null) {

s2 += s + "\n";

}

in.close();

BufferedReader stdin = new BufferedReader(new InputStreamReader(

System.in));

System.out.print("Enter a line:");

System.out.println(stdin.readLine());

// 2. 從內(nèi)存中讀入

StringReader in2 = new StringReader(s2);

int c;

while ((c = in2.read()) != -1) {

System.out.print((char) c);

}

// 3. 格式化內(nèi)存輸入

try {

DataInputStream in3 = new DataInputStream(new ByteArrayInputStream(

s2.getBytes()));

while (true) {

System.out.print((char) in3.readByte());

}

} catch (EOFException e) {

System.err.println("End of stream");

}

// 4. 文件輸入

try {

BufferedReader in4 = new BufferedReader(new StringReader(s2));

PrintWriter out1 = new PrintWriter(new BufferedWriter(

new FileWriter("IODemo.out")));

int lineCount = 1;

while ((s = in4.readLine()) != null) {

out1.println(lineCount++ + ": " + s);

}

out1.close();

} catch (EOFException e) {

System.err.println("End of stream");

}

// 5. 接收和保存數(shù)據(jù)

try {

DataOutputStream out2 = new DataOutputStream(

new BufferedOutputStream(new FileOutputStream("Data.txt")));

out2.writeDouble(3.14159);

out2.writeUTF("That was pi");

out2.writeDouble(1.41413);

out2.writeUTF("Square root of 2");

out2.close();

DataInputStream in5 = new DataInputStream(new BufferedInputStream(

new FileInputStream("Data.txt")));

System.out.println(in5.readDouble());

System.out.println(in5.readUTF());

System.out.println(in5.readDouble());

System.out.println(in5.readUTF());

} catch (EOFException e) {

throw new RuntimeException(e);

}

// 6. 隨機(jī)讀取文件內(nèi)容

RandomAccessFile rf = new RandomAccessFile("rtest.dat", "rw");

for (int i = 0; i 10; i++) {

rf.writeDouble(i * 1.414);

}

rf.close();

rf = new RandomAccessFile("rtest.dat", "rw");

rf.seek(5 * 8);

rf.writeDouble(47.0001);

rf.close();

rf = new RandomAccessFile("rtest.dat", "r");

for (int i = 0; i 10; i++) {

System.out.println("Value " + i + ": " + rf.readDouble());

}

rf.close();

}

}

package IO;

import java.io.*;

/**

* p

* Title: JAVA進(jìn)階訣竅

* /p

*

* @author 張峰

* @version 1.0

*/

public class MakeDirectoriesExample {

private static void fileattrib(File f) {

System.out.println("絕對路徑: " + f.getAbsolutePath() + "\n 可讀屬性: "

+ f.canRead() + "\n 可定屬性: " + f.canWrite() + "\n 文件名: "

+ f.getName() + "\n 父目錄: " + f.getParent() + "\n 當(dāng)前路徑: "

+ f.getPath() + "\n 文件長度: " + f.length() + "\n 最后更新日期: "

+ f.lastModified());

if (f.isFile()) {

System.out.println("輸入的是一個(gè)文件");

} else if (f.isDirectory()) {

System.out.println("輸入的是一個(gè)目錄");

}

}

public static void main(String[] args) {

if (args.length 1) {

args = new String[3];

}

args[0] = "d";

args[1] = "test1.txt";

args[2] = "test2.txt";

File old = new File(args[1]), rname = new File(args[2]);

old.renameTo(rname);

fileattrib(old);

fileattrib(rname);

int count = 0;

boolean del = false;

if (args[0].equals("d")) {

count++;

del = true;

}

count--;

while (++count args.length) {

File f = new File(args[count]);

if (f.exists()) {

System.out.println(f + " 文件己經(jīng)存在");

if (del) {

System.out.println("刪除文件" + f);

f.delete();

}

} else { // 如果文件不存在

if (!del) {

f.mkdirs();

System.out.println("創(chuàng)建文件： " + f);

}

}

fileattrib(f);

}

}

}

給段最簡單的java代碼 讓我新手看一下

最簡單的java代碼肯定就是這個(gè)了，如下：

public class MyFirstApp

{

public static void main(String[] args)

{

System.out.print("Hello world");

}

}

“hello world”就是應(yīng)該是所有學(xué)java的新手看的第一個(gè)代碼了。如果是零基礎(chǔ)的新手朋友們可以來我們的java實(shí)驗(yàn)班試聽，有免費(fèi)的試聽課程幫助學(xué)習(xí)java必備基礎(chǔ)知識，有助教老師為零基礎(chǔ)的人提供個(gè)人學(xué)習(xí)方案，學(xué)習(xí)完成后有考評團(tuán)進(jìn)行專業(yè)測試，幫助測評學(xué)員是否適合繼續(xù)學(xué)習(xí)java，15天內(nèi)免費(fèi)幫助來報(bào)名體驗(yàn)實(shí)驗(yàn)班的新手快速入門java，更好的學(xué)習(xí)java！

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