Thursday, 29 November 2018

Java Program Samples


package java_test_programs.abstract_pack.abstract_1;

abstract class A {
       abstract int sum(int i, int j);

       abstract int mul(int i, int j);

       abstract void getString(String str);
}

class B extends A {
       public int sum(int i, int j) {
              return (i + j);
       }

       int mul(int i, int j) {
              return (i * j);
       }

       void getString(String str) {
              System.out.println(str);
       }
}

class AbstractClass1 {
       public static void main(String args[]) {
              B b = new B();
              System.out.println(b.sum(5, 6));
              System.out.println(b.mul(5, 6));
              b.getString("Java");
       }
}

Output :
11
30
Java

/* abstract methods with concrete methods */
package java_test_programs.abstract_pack.abstract_2;

abstract class Abstract {
       abstract int sum(int i, int j);

       abstract int mul(int i, int j);

       abstract void getString(String str);

       void callMe() {
              System.out.println("I am callMe() of abstractClass");
       }
}

class B extends Abstract {
       int sum(int i, int j) {
              return (i + j);
       }

       int mul(int i, int j) {
              return (i * j);
       }

       void getString(String str) {
              System.out.println(str);
       }
}

class AbstractClass2 {
       public static void main(String args[]) {
              B b = new B();
              System.out.println(b.sum(5, 6));
              System.out.println(b.mul(5, 6));
              b.getString("Java");
              b.callMe();
       }
}


Output :
11
30
Java
I am callMe() of abstractClass

package java_test_programs.abstract_pack.abstract_3;

abstract class A {
       abstract int sum(int i, int j);
}

abstract class B extends A {
       abstract int mul(int i, int j);
}

class C extends B {
       int sum(int i, int j) {
              return (i + j);
       }

       int mul(int i, int j) {
              return (i * j);
       }
}

class AbstractClass3 {
       public static void main(String args[]) {
              C c = new C();
              System.out.println(c.sum(3, 4));
              System.out.println(c.mul(3, 4));
       }
}

Output :
7
12

package java_test_programs.abstract_pack.abstract_4;

class A {
       void print(String str) {
              System.out.println(str + "-Printed by A");
       }

       void get() {
              System.out.println("I am get() of A");
       }
}

abstract class B extends A {
       abstract void callMe();
}

class C extends B {
       void callMe() {
              System.out.println("I am callMe");
       }

       void print(String str) {
              System.out.println(str + "-Printed by C");
       }

       void get() {
              System.out.println("I am get() of C");
       }
}

class AbstractClass4 {
       public static void main(String args[]) {
              C c = new C();
              c.callMe();
              c.print("Java");
              c.get();
       }
}
Output :

I am callMe
Java-Printed by C
I am get() of C

package java_test_programs.abstract_pack.abstract_5;

abstract class A {
       void get1() {
              System.out.println("I am get1() of A");
       }

       void get2() {
              System.out.println("I am get2() of A");
       }

       void get3() {
              System.out.println("I am get3() of A");
       }

       void get4() {
              System.out.println("I am get4() of A");
       }
}

class B extends A {
       void callMe() {
              System.out.println("I am callMe()");
       }

       void get2() {
              System.out.println("I am get2() of B");
       }

       void get4() {
              System.out.println("I am get4() of B");
       }
}

class AbstractClass5 {
       public static void main(String args[]) {
              B b1 = new B();
              b1.get1(); // A
              b1.get2(); // B
              b1.get3(); // A
              b1.get4(); // B
              b1.callMe(); // B

              A b2 = new B();
              b2.get1(); // A
              b2.get2(); // B
              b2.get3(); // A
              b2.get4(); // B

       }
}

Output :


I am get1() of A
I am get2() of B
I am get3() of A
I am get4() of B
I am callMe()
I am get1() of A
I am get2() of B
I am get3() of A
I am get4() of B

package java_test_programs.thread_pack.therad_1;

class Item {
       int x;

       void get() {
              System.out.println("I am get");
              try {
                     Thread.sleep(1000);
              } catch (Exception e) {
              }
              System.out.println("I am get after sleep");
              x = 10;
       }

       void calc() {
              System.out.println("I am Calc");
              System.out.println("x=" + x);
       }
}

class Thread1 implements Runnable {
       Item ob;
       Thread t;

       Thread1(Item ob) {
              this.ob = ob;
              t = new Thread(this);
              t.start();
       }

       public void run() {
              while (true) {
                     ob.get();
                     try {
                           Thread.sleep(1000);
                     } // try
                     catch (Exception e) {
                     }
              } // while
       }// run
}// class

class Thread2 implements Runnable {
       Item ob;
       Thread t;

       Thread2(Item ob) {
              this.ob = ob;
              t = new Thread(this);
              t.start();
       }

       public void run() {
              while (true) {
                     ob.calc();
                     try {
                           Thread.sleep(1000);
                     } // try
                     catch (Exception e) {
                     }
              } // while
       }// run
}// class

class AccessingObjectMembersMain {
       public static void main(String args[]) {
              Item ob = new Item();
              Thread1 t1 = new Thread1(ob);
              Thread2 t2 = new Thread2(ob);
       }
}


Output :

I am get
I am Calc
x=0
I am get after sleep
I am Calc
x=10
I am Calc
I am get
x=10
I am get after sleep
I am Calc
x=10
I am get
I am Calc
x=10

package java_test_programs.thread_pack.therad_2;
class Item {
       int x;

       synchronized void get() {
              System.out.println("I am get");
              try {
                     Thread.sleep(1000);
              } catch (Exception e) {
              }
              System.out.println("I am get after sleep");
              x = 10;
       }

       synchronized void calc() {
              System.out.println("I am Calc");
              System.out.println("x=" + x);
       }
}

class Thread1 implements Runnable {
       Item ob;
       Thread t;

       Thread1(Item ob) {
              this.ob = ob;
              t = new Thread(this);
              t.start();
       }

       public void run() {
              while (true) {
                     ob.get();
                     try {
                           Thread.sleep(1000);
                     } // try
                     catch (Exception e) {
                     }
              } // while
       }// run
}// class

class Thread2 implements Runnable {
       Item ob;
       Thread t;

       Thread2(Item ob) {
              this.ob = ob;
              t = new Thread(this);
              t.start();
       }

       public void run() {
              while (true) {
                     ob.calc();
                     try {
                           Thread.sleep(1000);
                     } // try
                     catch (Exception e) {
                     }
              } // while
       }// run
}// class

class AccessingObjectMembersSyncMain {
       public static void main(String args[]) {
              Item ob = new Item();
              Thread1 t1 = new Thread1(ob);
              Thread2 t2 = new Thread2(ob);
       }
}

Output :
I am get
I am get after sleep
I am Calc
x=10
I am get
I am get after sleep
I am Calc
x=10
I am get
I am get after sleep
I am Calc
x=10
I am Calc
x=10
I am get
I am get after sleep
I am Calc
x=10
I am get
I am get after sleep
I am Calc
x=10

package java_test_programs_exception_pack.exception_1;

class AgeException extends Exception {
       String msg = "";

       AgeException(String msg) {
              this.msg = msg;
       }

       AgeException() {
       }

       public String toString() // java.lang.Object
       {
              if (msg.equals(""))
                     return "Invalid age, please try to type within 100";
              else
                     return msg + " is a invalid age, please try to type within 100";
       }
}

package java_test_programs.operators_pack.operator_1;

class ArithAssignOp {
       public static void main(String args[]) {
              int a = 2;
              int b = 3;
              int c = 2;
              int d = 7;
              a += 5;
              b -= 2;
              c += a * b;
              // c=2+(7*1);
              d %= 2;
              System.out.println("a=" + a);
              System.out.println("b=" + b);
              System.out.println("c=" + c);
              System.out.println("d=" + d);
       }
}

Output :

a=7
b=1
c=9
d=1

package java_test_programs.operators_pack.operator_1;

class ArithOperators {
       public static void main(String args[]) {
              int x = 11, y = 5;
              System.out.println("x+y=" + (x + y));
              System.out.println("x-y=" + (x - y));
              System.out.println("x*y=" + (x * y));
              System.out.println("x/y=" + (x / y));
              System.out.println("x%y=" + (x % y));
       }
}

Output :

x+y=16
x-y=6
x*y=55
x/y=2
x%y=1

package java_test_programs_arrays_pack_arrays_1;
import java.io.*;

class Array1 {
       public static void main(String args[]) {
              try {
                     DataInputStream dis = new DataInputStream(System.in);
                     int a[] = new int[5];
                     System.out.println("Enter the Elements");
                     for (int i = 0; i < a.length; i++)
                           a[i] = Integer.parseInt(dis.readLine());
                     System.out.println("Result");
                     for (int i = 0; i < a.length; i++)
                           System.out.println(a[i]);
              } catch (Exception e) {
                     System.out.println(e);
              }
       }
}

Output :

package java_test_programs_arrays_pack_arrays_1;
class ArrayAssignDemo
{
public static void main(String args[])
{
int x[][][][]=new int[2][2][2][2];
int y[][]=x[0][0];

}
}

package java_test_programs_arrays_pack_arrays_1;

class ArrayDemo {
       public static void main(String args[]) {
              int a[] = { 1, 2, 3, 4 };
              for (int i = 0; i < 4; i++)
                     System.out.println(a[i]);
              String str[] = { "Java", "RMI", "JSP", "EJB" };
              for (int i = 0; i < 4; i++)
                     System.out.println(str[i]);
              char ch[] = { 'a', 'b', 'c', 'd' };
              for (int i = 0; i < 4; i++)
                     System.out.println(ch[i]);
       }
}

Output :
1
2
3
4
Java
RMI
JSP
EJB
a
b
c
d

package java_test_programs_arrays_pack_arrays_1;

class ArrayFor {
       public static void main(String ar[]) {
              int z = 10;
              int x[] = new int[z];
              for (int i = 0; i < x.length; i++) {
                     x[i] = i + 1;
                     System.out.println(x[i]);
              }
              for (int i = 0; i < x.length; i++) {
                     System.out.println("The Position is" + i);
                     System.out.println(x[i]);
              }
       }
}


Output :

1
2
3
4
5
6
7
8
9
10
The Position is0
1
The Position is1
2
The Position is2
3
The Position is3
4
The Position is4
5
The Position is5
6
The Position is6
7
The Position is7
8
The Position is8
9
The Position is9
10

package java_test_programs_arrays_pack_arrays_1;

import java.io.*;

class ArrayForEach {
       public static void main(String arg[]) {
              try {
                     int m[] = new int[10];
                     DataInputStream dis = new DataInputStream(System.in);
                     System.out.println("Enter The Length ");
                     int x = Integer.parseInt(dis.readLine());
                     for (int i = 0; i < x; i++) {
                           System.out.print("x[" + i + "]:");
                           m[i] = Integer.parseInt(dis.readLine());
                     }
                     for (int z : m) // For Each
                     {
                           System.out.println(z);
                     }
              } catch (IOException ex) {
                     System.out.println("Excepation Raised: " + ex);
              }

       }

}

package java_test_programs_arrays_pack_arrays_1;

class ArrayRunTime {
       public static void main(String args[]) {
              int s = 3;
              int x[] = new int[s];
              System.out.println("S");
              for (int i = 0; i < s; i++) {
                     x[i] = i + 1;
                     System.out.println(x[i]);
              }
              int t = 5;
              x = new int[t];
              System.out.println("t");
              for (int i = 0; i < 5; i++) {
                     x[i] = i + 5;
                     System.out.println(x[i]);
              }
       }
}

Output :

S
1
2
3
t
5
6
7
8
9



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