Example - String print


class TwoStrings {
     void print(String str1,String str2) {
        System.out.print(str1);
        try {
            Thread.sleep(50);
        } catch (InterruptedException ie) {        }
        System.out.println(str2);
    }
}

class PrintStringsThread extends Thread {
     String str1, str2;
     TwoStrings ts;
     PrintStringsThread(String str1, String str2,     TwoStrings ts) {
        this.str1 = str1;
        this.str2 = str2;
        this.ts = ts;
        this.start(); 
    }
    public void run() {
            ts.print(str1, str2);
    }
}

public class App {
    public static void main(String args[]) {
         TwoStrings ts = new TwoStrings();
        new PrintStringsThread("Hello ", "there.",ts);
        new PrintStringsThread("How are ", "you?",ts);
        new PrintStringsThread("Thank you ", "very much!",ts);
    }
}
 
How are Hello Thank you there.
you?
very much!

 

Synchronized method

class TwoStrings {
     synchronized void print(String str1,String str2) {
        System.out.print(str1);
        try {
            Thread.sleep(50);
        } catch (InterruptedException ie) {        }
        System.out.println(str2);
    }
}

class PrintStringsThread extends Thread {
     String str1, str2;
     TwoStrings ts;
     PrintStringsThread(String str1, String str2,     TwoStrings ts) {
        this.str1 = str1; 
        this.str2 = str2;
        this.ts = ts;
        this.start();  
    }
    public void run() {
            ts.print(str1, str2);
    }
}

public class App {
    public static void main(String args[]) {
         TwoStrings ts = new TwoStrings();
        new PrintStringsThread("Hello ", "there.",ts);
        new PrintStringsThread("How are ", "you?",ts);
        new PrintStringsThread("Thank you ", "very much!",ts);
    }
}
 
Hello there.
Thank you very much!
How are you?

 

 
Synchronized object

class TwoStrings {
     void print(String str1,String str2) {
        System.out.print(str1);
        try {
            Thread.sleep(50);
        } catch (InterruptedException ie) {        }
        System.out.println(str2);
    }
}

class PrintStringsThread extends Thread {
     String str1, str2;
     TwoStrings ts;
     PrintStringsThread(String str1, String str2,     TwoStrings ts) {
        this.str1 = str1; 
        this.str2 = str2;
        this.ts = ts;
        this.start();  
    }
    public void run() {
         synchronized  (ts) {
            ts.print(str1, str2);
         }
    }
}

public class App {
    public static void main(String args[]) {
         TwoStrings ts = new TwoStrings();
        new PrintStringsThread("Hello ", "there.",ts);
        new PrintStringsThread("How are ", "you?",ts);
        new PrintStringsThread("Thank you ", "very much!",ts);
    }
}
 
Hello there.
How are you?
Thank you very much!