CloneDemo

class TestClone implements Cloneable {

int a;

double b;

// This method calls Object's clone().

TestClone cloneTest() {

try {

// call clone in Object.

return (TestClone) super. clone ();

}

catch(CloneNotSupportedException e) {

System.out.println ("Cloning not allowed.");

return this;

}

}

}

class CloneDemo {

public static void main(String args[]) {

TestClone x1 = new TestClone ();

TestClone x2;

x1.a = 10;

x1.b = 20.98;

x2 = x1.cloneTest(); // clone x1

System.out.println ("x1: " + x1.a + " " + x1.b);

System.out.println ("x2: " + x2.a + " " + x2.b);

}

}

Command prompt

C:\java\adv java>javac CloneDemo.java

C:\java\adv java>java CloneDemo

x1: 10 20.98

x2: 10 20.98

: to get member variable of java class

import java.lang.reflect.*;

public class app6

{

public static void main(String args[])

        {

                        printField (args[0]);

        }

        public static void printField(String name)

        {

                        try

                        {

                                        Class c=Class.forName (name);

                        Field [] f=c.getDeclaredFields ();    

                                        System.out.println ("declare of member variable belonging to  "+ name+ "class are");

                                        for (int i=0;i<f.length ;++i )

                                        {

                                                        String fname=f[i].getType ().getName ();

                                        int x=f[i].getModifiers();

                                        if (Modifier.isPublic(x))

                                                        System.out.println ("public");

                                        if (Modifier.isFinal(x))

                                                        System.out.println ("final");

                                        if (Modifier.isStatic(x))

                                                        System.out.println ("Static");

                                        if (Modifier.isPrivate(x))

                                                        System.out.println ("private");

                                        if(Modifier.isProtected(x))

                                                        System.out.println ("Protected");

                                        if(Modifier.isTransient(x))

                                                        System.out.println ("transient");

                        }

                        }

                        catch(ClassNotFoundException cnf)

                        {

                                        cnf.printStackTrace ();

                        }

                        catch(Exception e)

                        {

                                        e.printStackTrace ();

                       

}

                        }

                        }

Command prompt

C:\java\adv java>javac app6.java

C:\java\adv java>java app6 java.lang.String

declare of member variable belonging to  java.lang.String class are

final

private

final

private

final

private

private

final

Static

private

final

Static

private

public

final

Static

to get modifier of given java class

import java.lang.reflect.*;

public class app5

{

public static void main(String args[])

        {

                        listModifier (args[0]);

        }

        public static void listModifier(String name)

        {

                        try

                        {

                                        Class c=Class.forName (name);

                                        int x=c.getModifiers();

                                        System.out.println ("modifier of "+ name+ "class are");

                                        if(Modifier.isPublic(x))

                                                        System.out.println ("public");

                                        if(Modifier.isFinal(x))

                                                        System.out.println ("final");

                                        if(Modifier.isAbstract(x))

                                                        System.out.println ("abstract");

                        }

                        catch (ClassNotFoundException cnf)

                        {

                                        cnf.printStackTrace ();

                        }

        catch(Exception e)

                        {

                                        e.printStackTrace ();

}}}

Command prompt:

C:\java\adv java>javac app5.java

C:\java\adv java>java app5 java.lang.System

modifier of java.lang.Systemclass are

public

final

C:\java\adv java>java app5 java.lang.Integer

modifier of java.lang.Integerclass are

public

final

C:\java\adv java>java app5 java.awt.Button

modifier of java.awt.Buttonclass are

public

C:\java\adv java>java app5 java.lang.Number

modifier of java.lang.Number class are

public

abstract

C:\java\adv java>

to get all interface implement by that class

• //app4.java
  public class app4
  {
  public static void main(String args[])
          {
          printInterface (args[0]);
          }
          public static void printInterface(String name)
          {
                          try
                          {
                                          Class c = Class.forName (name);
                                          Class i [] =c.getInterfaces ();
                                          System.out.println ("interface implemented by" + name +"class are");
                                          for (int x=0;x<i.length ;++x )
                                          {
                                          String iname=i[x].getName ();
                                          System.out.println ("\t\t"+ iname);
                                          }
                          }
                                          catch(ClassNotFoundException cnf)
                          {
                          cnf.printStackTrace ();
                          }
                          catch (Exception e)
                          {
                                          e.printStackTrace ();
                          }
  }
  }
  Command prompt
  C:\java\adv java>javac app4.java
  C:\java\adv java>java app4 java.lang.Integer
  Interface implemented by java.lang.Integerclass are
                  java.lang.Comparable
  C:\java\adv java>java app4 java.awt.Button
  Interface implemented by java.awt.Buttonclass are
                  javax.accessibility.Accessible
  C:\java\adv java>java app4 java.lang.String
  Interface implemented by java.lang.String class are
                  java.io.Serializable
                  java.lang.Comparable
                  java.lang.CharSequence

to get all the classes of inheritance hierarchy for a given class

//app3.java

public class app3

{

                public static void main(String args[])

                {

                                printhierachy (args[0]);

                }

                public static void printhierachy(String name)

                {

                                try

                                {

                                                Class c=Class.forName (name);

                                                Class sc=c.getSuperclass ();

                                                System.out.println ("inheritance hierarchy class of "+name +"classes are");

                                                while(sc!=null)

                                                {

                                                                System.out.println (""+sc.getName ());

                                                                c=sc;

                                                                sc=c.getSuperclass();

                                                }

                                }

                                catch (Exception e)

                                {

                                                e.printStackTrace ();

                                }

                }

}

Command prompt:

C:\java\adv java>javac app3.java

C:\java\adv java>java app3 java.lang.Integer

Inheritance hierarchy classes of java.lang.Integerclass are

java.lang.Number

java.lang.Object

C:\java\adv java>java app3 java.lang.Float

Inheritance hierarchy classes of java.lang.Floatclass are

java.lang.Number

java.lang.Object

C:\java\adv java>java app3 java.awt.Button

Inheritance hierarchy classes of java.awt.Buttonclass are

java.awt.Component

java.lang.Object

C:\java\adv java>

: If object c represents java.lang.String Class, then ‘sc’ represents java.lang.Object Class

//app2.java

public class app2

{

                public static void main(String args[])

                {

                                printSuperclass (args[0]);

                }

                public static void printSuperclass(String name)

                {

                                try

                                {

                                                Class c=Class.forName (name);

                                                Class sc=c.getSuperclass ();

                                                System.out.println (c.getName () +"extends" + sc.getName ());

                                }

                                catch(Exception e)

                                {

                                                e.printStackTrace ();

                                }

                }

}

In command prompt:

C:\java\adv java>javac app2.java

C:\java\adv java>java app2 java.lang.String

java.lang.Stringextendsjava.lang.Object

C:\java\adv java>java app2 java.lang.Integer

java.lang.Integerextendsjava.lang.Number

C:\java\adv java>java app2 app2

app2extendsjava.lang.Object

C:\java\adv java>

A program to now whether given input is class or interface name

//app1.java

public class app1

{

                public static void main(String args[])throws Exception

{

                Class c=Class.forName (args [0]);

                boolean b=c.isInterface();

                if(b)

                                System.out.println (args [0] +"is an interface");

                else

                                System.out.println (args [0] +" is a class");

}

}

In command prompt

C:\java\adv java>javac app1.java

C:\java\adv java>java app1 java.lang.System

java.lang.System is a class

C:\java\adv java>java app1 java.lang. Runnable

Java.lang. Runnable is an interface

C:\java\adv java>