Compilation will fail.
Compilation will succeed and the program will print “0”
Compilation will succeed and the program will print “1”
Compilation will succeed and the program will print “2”
第1题:
class Super { public Integer getLenght() { return new Integer(4); } } public class Sub extends Super { public Long GetLenght() { return new Long(5); } public static void main(String[] args) { Super sooper = new Super(); Sub sub = new Sub(); System.out.println( sooper.getLenght().toString() + “,” + sub.getLenght().toString() ); } } What is the output?()
第2题:
class super { public int getLength() {return 4;} } public class Sub extends Super { public long getLength() {return 5;} public static void main (String[]args) { super sooper = new Super (); Sub sub = new Sub(); System.out.printIn( sooper.getLength()+ “,” + sub.getLength() }; } What is the output?()
第3题:
设有类定义如下:
class Base{
public Base(int i){}
}
public class MyOver extends Base{
public static void main(String arg[]){
MyOver m = new MyOver(10);
}
MyOver(int i){
super(i);
}
MyOver(String s, int i){
this(i);
//Here
}
}
以下哪条语句可以安排在//Here处 ?
A.MyOver m = new MyOver();
B.super();
C.this("Hello",10);
D.Base b = new Base(10);
第4题:
Public class test ( Public static void stringReplace (String text) ( Text = text.replace („j„ , „i„); ) public static void bufferReplace (StringBuffer text) ( text = text.append (“C”) ) public static void main (String args ){ String textString = new String (“java”); StringBuffer text BufferString = new StringBuffer (“java”); stringReplace (textString); BufferReplace (textBuffer); System.out.printIn (textString + textBuffer); } ) What is the output?()
第5题:
class Super { public int i = 0; public Super(String text) { i = 1; } } public class Sub extends Super { public Sub(String text) { i = 2; } public static void main(String args[]) { Sub sub = new Sub(“Hello”); System.out.println(sub.i); } } What is the result?()
第6题:
class Super { public int getLenght( ) { return 4; } } public class Sub extends Super { public long getLenght( ) { return 5; } public static void main(String[] args) { Super sooper = new Super( ); Sub sub = new Sub( ); System.out.println( sooper.getLenght( ) + “,” + sub.getLenght( ) ); } } What is the output?()
第7题:
class A { public A() { System.out.println(“hello from a”); } } class B extends A { public B () { System.out.println(“hello from b”); super(); } } public class Test { public static void main(String args[]) { A a = new B(); } } What is the result when main is executed?()
第8题:
( 30 )在程序的下划线处应填入的选项是
public class Test _________{
public static void main(String args[]){
Test t = new Test();
Thread tt = new Thread(t);
tt.start();
}
public void run(){
for(int i=0;i<5;i++){
system.out.println( " i= " +i);
}
}
}
A ) implements Runnable
B ) extends Thread
C ) implements Thread
D ) extends Runnable
第9题:
class Super { public int getLenght() { return 4; } } public class Sub extends Super { public long getLenght() { return 5; } public static void main(String[] args) {Super sooper = new Super(); Sub sub = new Sub(); System.out.println( sooper.getLenght() + “,” + sub.getLenght() ); } } What is the output? ()
第10题:
public class Test { public static void leftshift(int i, int j) { i<<=j; } public static void main(String args[]) { int i = 4, j = 2; leftshift(i, j); System.out.printIn(i); } } What is the result?()