SCJP 1.4 Mock Exam – 15

public class Master{
    boolean bContinue=false;
    public static void main(String argv[]){
	Master m = new Master();
	m.go();
    }
    public void go(){
	Slave s = new Slave(this);
	Thread t1 = new Thread(s);
	t1.start();
	while(bContinue==false){
	}
	s.setPrice(200);
    }
}

class Slave implements Runnable{
    int iPrice =100;
    Master master;
    Slave(Master m){
	master=m;
    }
    synchronized public void setPrice(int iM){
	iPrice=iM;	
    }

    synchronized public void run(){
	master.bContinue=true;
	while(true){
	    System.out.println(iPrice);
	}

    }
}

public class Tux extends Thread{
	static String sName = “Techno”;
	public static void main(String argv[]){
		Tux t = new Tux();
		t.name(sName);
		System.out.println(sName);
	}
	public void name(String sName){
		sName = sName + ” park”;
		start();
		}
	public void run(){
		for(int i=0;i < 4; i++){
			sName = sName + ” ” + i;
	        }
	}
 }

public class RandomExample{
    public static void main(String argv[]){
        int iRand;
        iRand = Math.random();
        System.out.println(iRand);
    }
}

import java.util.*;
public class TechnoExample{
    public static void main(String argv[]){
	TechnoExample junk = new TechnoExample();
	junk.sampleMap();
    }
    public void sampleMap(){
	TreeMap tm = new TreeMap();
	tm.put(“a”,”Bill”);
	tm.put(“b”,”Kathy”);
	tm.put(“c”,”Carl”);
	Iterator it = tm.keySet().iterator();
	while(it.hasNext()){
	    System.out.print(tm.get(it.next()));
	}
    }
}

class Biddy{
    public Biddy(){
	System.out.print(” Biddy “);
    }
}
class Val extends Biddy{
    public Val(){
	System.out.print(” Val “);
    }
}

public class BluePeter extends Val{
    public static void main(String argv[]){
	BluePeter bp = new BluePeter();
	bp.shep(3);
    }
    public void shep(float i){
	System.out.println(i);
    }
}

class Base{
    public int iAcres=3;
}
public class Mfields extends Base{
    private int iAcres=3.5;
    public static void main(String args[]){
	Base mf = new Mfields();
	System.out.println(mf.iAcres);
    }
}

1 public class RJMould{
2     StringBuffer sb;
3     public static void main(String argv[]){
4 	RJMould rjm = new RJMould();
5 	rjm.kansas();
6    }
7     public void kansas(){
8 	sb = new StringBuffer(“Manchester”);
9 	StringBuffer sb2 = sb;
10 	StringBuffer sb3 = new StringBuffer(“Chester”);
11 	sb=sb3;
12 	sb3=null;
13 	sb2=null; 
14     }
15 }

public class HarHam{
	public static void main(String argv[]){
		HarHam hh = new HarHam();
		hh.go();
        }
        public void go(){
	  String har = new String (“har”);
	  String ham = new String(“har”);

	  collar:	
	  for(int i=0; i < 2 ; i ++){
	     if(har==ham){
		  break collar;
	     }

	     if(i > 0){
		continue collar;
 	     }			
	     System.out.print(i);
	  } // for i
	}
}

protected class Wmid{
    private Wmid(String sName){
	System.out.println(“Wmid”);
    }	

    Wmid(){}
}

public class Ombers extends Wmid{
    public static void main(String argv[]){
	Ombers o = new Ombers();
    }

}

public class Mickle  extends Thread implements Runnable{
    public static void main(String argv[]){
	Mickle m = new Mickle();
	m.start();
    
    }
    public void run(){
	go();
    }
     public void  go(){
	int i;
	while(true){
	    try{
		wait();
		System.out.println(“interrupted”);
	    }catch (InterruptedException e) {}
	}
    }
}

public class TechnoSample {
	public static void main(String[] args) {
		int i=3;
		System.out.println(getBoolean()? i=2*i++:i+++ ++i);
	}

	public static boolean getBoolean(){
		if((int)(Math.random()*2)==0)
			return false;
		else
			return true;
	}
}

 
class Super{
    public void go(){
	System.out.print(“Super”);
    }

}

public class SupEx extends Super{
    public static void main(String argv[]){
	//Here
	s.go();
    }
    public void go(){
	System.out.println(“SupEx”);
    }
}

public class Photos {
    private int iKey;
    private String sValue;
        
    public Photos(int iKey, String sValue){
        this.iKey=iKey;   
	this.sValue=sValue;
    }
    
    public int hashCode(){
	return super.hashCode();
    }
    
    public boolean equals(Object o){
	if(o instanceof Photos){
	    if(this.hashCode() == o.hashCode()){
		return true;
	    }
	}
	return false;
    }    
}

public class MyClass
{
    public static void main(String[] args)
    {
        String s = “hello”;
        StringBuffer sb = new StringBuffer(s);

        sb.reverse();

        if (s == sb)
            System.out.println(“a”);
        if (s.equals(sb))
            System.out.println(“b”);
        if (sb.equals(s))
            System.out.println(“c”);
    }
} // MyClass

class Harpic{
    public void finalize(){
	System.out.println(“Harpic”);
    }

}

public class ArmitageShanks{
    Harpic har;
    public static void main(String argv[]){
	ArmitageShanks as = new ArmitageShanks();
	as.oui();
    }
    public void oui(){
	har = new Harpic();
	mno(har);
	//one
	har=null;

    }
    public void mno(Harpic har){
	Harpic pic=har;
	//two
	pic=null;
	//three
	har=null;
    }
}

class TSamp extends Thread {
    public native String getTime();  
}

public class Multi implements Runnable {
    boolean bStop;
    public static void main(String argv[]){
	Multi m = new Multi();
	m.go();
    }
    public void go(){
	TSamp ts = new TSamp(this);
	ts.start();
	bStop=true;
	
    }
    public void run(){
	if(bStop==true){
	    return;
	}
	System.out.println(“running”);
    }
}

public class Cote{
    public static void main(String argv[]){
        Cote c = new Cote();
        c.go(argv[0]);
    }
    public void go(String s){
        int i = Integer.parseInt(s);
        if(i > 0){
            System.out.println(i);
        }else{
            throw new AssertionError(i);
        }
    }
}

import java.util.*;
public class Chawson{
	public static void main(String argv[]){
	Chawson c = new Chawson();
	c.whittan();
}
public void whittan(){
	HashSet hs = new HashSet();
	hs.add(“one”);
	hs.add(“two”);
	hs.add(“one”);
	wyche(hs);
}
	public void wyche(Set s){
		HashSet hs = (HashSet) s;	
		System.out.println(hs.size());	
	}
}

 public static void main(String[] args ){
   int n = 11 ;
   do { 
     System.out.print( ” ” + n– );
   }while( (n % 4) != 0 );
   System.out.println( ” final ” + n ); 
 }

 public static void main (String[] args){
   String s1 = ” Arg ” + args[1] ;
   s1.trim();
   String s2 = “:” + s1 + args[2] ;
   System.out.println( s2 + “:” );
 }

What will be printed when this is executed with the following command
line?



java TechnoSample alpha beta gamma delta

public class TechnoSample{ 
 
 static Object theObj ;
 static Object[] someObj ;
 static String letters[] = {“A”, “B”, “C”, “D” };      
 static char[] caps = {‘A’, ‘B’, ‘C’, ‘D’ };
 
 public static void main (String[] args){
   someObj = new Object[ 3 ] ;
   int[] theInts = null ;
   // what can go here?
 }

Select statements that could replace the comment without causing a
compiler error.

1 public void testC(char ch) {
2   Integer ss = new Integer( ch );
3   Character cc = new Character( ch ) ;
4   if( ss.equals( cc )) System.out.println(“equals”);
5   if( ss.intValue() == cc.charValue() ){
6       System.out.println(“EQ”);
7   }
8 }

    boolean hashFlag = ( x.hashCode() == y.hashCode() );
    boolean equalsFlag = x.equals( y );
    boolean eqFlag = ( x == y );

Which of the following statements about the relationship between these
tests are true.