執行緒總是由作業系統佔有和管理，一個新執行緒的建立和啟動只能由作業系統來負責管理。故不能直接呼叫該執行緒的run方法，若如此，則不會建立新的`執行緒和啟動該執行緒，而是和其它類物件一樣，那麼應該怎樣正確啟動執行緒呢?呼叫執行緒物件的start方法。當呼叫Thread物件的start方法時，就會呼叫一個本地的程式碼，該程式碼負責是作業系統初始化一個新的執行緒，並由這個執行緒類執行Thread物件的run方法。
建立一個執行緒有兩種方式：其一是繼承Thread類並重載run方法;其二是實現Runnable介面。
第一種方法的程式碼如下：
import .*;
import .*;
class ThreadTest {
/**
* Method main
*
*
* @param args
*
*/
public static void main(String[] args) {
// Create three threads
CustomThread first=new CustomThread("Hopalong ","Cassidy ",200l);
CustomThread second=new CustomThread("Marilyn ","Monroe ",300l);
CustomThread third=new CustomThread("Slim ","Pickens ",500l);
tln("Press Enter when you hava had enought...");
t();
t();
t();
try{
();// Wait until Enter key pressed
tln("Enter pressed...");
}
catch(IOException e){// Handle IO Exception
tln(e );// Output the exception
}
tln("Ending main()...");
return;
}
// Inner class
private static class CustomThread extends Thread{
// Constructor
public CustomThread(String firstName,String secondName,long aWhile){
tName=firstName;
ndName=secondName;
le=aWhile;
aemon(true);
}
// override run method
public void run(){
try{
while(true){
sp; tln(tName);
p(aWhile);
tln(ndName);
}
}
catch(InterruptedException e){
tln(firstName+secondName+e);
}
}
// Constants and Variables
private String firstName;
private String secondName;
private long aWhile;
}
}
第二種建立執行緒的方法程式碼如下：
import .*;
import .*;
class ThreadTest1 {
/**
* Method main
* @param args
*/
public static void main(String[] args) {
// Create three threads
Thread first=new Thread(new CustomThread("Hopalong ","Cassidy ",200l));
Thread second=new Thread(new CustomThread("Marilyn ","Monroe ",300l));
Thread third=new Thread(new CustomThread("Slim ","Pickens ",500l));
tln("Press Enter when you hava had enought...");
aemon(true);
aemon(true);
aemon(true);
t();
t();
t();
try{
();// Wait until Enter key pressed
tln("Enter pressed...");
}
catch(IOException e){// Handle IO Exception
tln(e );// Output the exception
}
tln("Ending main()...");
return;
}
// Inner class
Private static class CustomThread implements Runnable{
// Constructor
public CustomThread(String firstName,String secondName,long aWhile){
tName=firstName;
ndName=secondName;
le=aWhile;
}
// override run method
public void run(){
try{
while(true){
tln(tName);
p(aWhile);
tln(ndName);
}
}
catch(InterruptedException e){
tln(firstName+secondName+e);
}
}
// Constants and Variables
private String firstName;
private String secondName;
private long aWhile;
}
}
