Object Type cast Example

package funds;
class Myt extends Thread
{
    public void  run()
    {
        System.out.println("thread");
    }    
}
public class TypecastInter {
    public static void main(String arg[])
    {
        Runnable r=(Runnable)new Myt();     //valid
        r.run();
        
        Runnable r1=(Thread)new Myt();    //valid
        r1.run(); // if Myt implements Runnable error
        
    //    Thread t1=(Runnable)new Myt(); //error in any case
        
        
        // using Api classes
        
            Object o1=new String("java");
            String s=(String)o1;   //valid
           String s=(Object)(new String(“abc”); // not valid
           String s1=(StringBuffer)(new Object()); // not valid
           String s=(StringBuffer)(new String(“abc”)); // not valid
            
            byte b=10;
            Number n=(Integer)(new Byte(b));  //not valid
            Number b1=(Number)(new Integer(10));   //valid
            
           Throwable r=(Exception)(new Error()); // not valid
            Throwable t=(Error)(new Error());   //valid

            
                        
            Object o=(Object)new Thread();
            //o.run();  //error
    }
}

output:
thread
thread