1. class Super { 
2. public float getNum（） { return 3.0f； } 
3. } 
4.  
5. public class Sub extends Super { 
6.  
7. } 
Which method， placed at line6， causes compilation to fail？（）  

public class Test { 
public int aMethod（） { 
static int i = 0； 
i++； 
return i； 
} 
public static void main （String args[]） { 
Test test = new Test（）； 
test.aMethod（）； 
int j = test.aMethod（）； 
System.out.println（j）； 
} 
} 
What is the result？（）  

public class ArrayTest { 
public static void main（String[] args） { 
float fl[]， f2[]； 
fl = new float[10]； 
f2 = f1； 
System.out.println（“f2[0]= “ + f2[0]）； 
} 
} 
What is the result？（）  

public class Test{ 
public static void main（ String[] argv ）{ 
// insert statement here 
} 
}  
Which statement， inserted at line 3， produces the following output？（） 
Exception in thread “main” java.lang.AssertionError： true at Test.main（Test.java：3）  

public class Delta { 
static boolean foo（char c） { 
System.out.print（c）； 
return true； 
} 
public static void main（ String[] argv ） { 
int i =0； 
for （ foo（‘A’）； foo（‘B’）&&（i<2）； foo（‘C’））{ 
i++ ； 
foo（‘D’）； 
} 
} 
} 
What is the result？（）  

class A { 
protected int method1（int a， int b） { return 0； } 
} 
Which two are valid in a class that extends class A？（） 

package test1； 
public class Test1 { 
static int x = 42； 
} 
package test2； 
public class Test2 extends test1.Test1 { 
public static void main（String[] args） {
System.out.println（“x = “ + x）； 
} 
} 
What is the result？（） 

public interface Foo { 
int k = 4； 3. } 
Which three are equivalent to line 2？（）

public class Test { 
public static void aMethod（） throws Exception { 
try { 
throw new Exception（）；
} finally { 
System.out.println（“finally”）； 
} 
} 
public static void main（String args[]） { 
try { 
aMethod（）； 
} catch （Exception e） { 
System.out.println（“exception”）； 
} 
System.out.println（“finished”）； 
} 
} 
What is the result？（）  

int x = 3; 
int y = 1; 
if (x = y) { 
System.out.println(“x = “ + x); 
} 
What is the result? （）