0
3
Compilation fails.
An exception is thrown at runtime.
第1题:
下列代码的执行结果是public class Test{ public int aMethod(){ static int i=0; i++; System.out.println(i); } public static void main(String args[]){ Test test= new Test(); test. aMethod(); }}
A.编译错误
B.0
C.1
D.运行成功,但不输出
第2题:
下面代码的运行结果是 public class Test{ public static void main(String args[]){ for(int i=0; i<3;i++){ if(i<2) continue; System.out.println(i); } } }
A.0
B.1
C.2
D.3
第3题:
下列程序的运行结果是( )。 public class test{ private String[]data={¨10","10.5"); public void fun{ double s=0: for(int i=0;i<3;j++){ try{ s=s+Integer.parseInt(data[i]); catch(Exception e){ System.out.print("errorl:"+data[i]); } } } public static void main(string[]args){ try{ test d=new test: fun: }catch(Exception e){ System.OUt.println("error2") } } }
A.errorl:10.5
B.error2
C.errorl:10.5 error2
D.以上都不对
第4题:
下列程序的运行结果是( )。 public class test{ private String[]data={¨10","10.5"}, public void fun( double S=0; for(int i=0;i<3;i++){ try{ s=s+Integer.parseInt(data[i]); catch(Exception e){ System.out.print(“errorl:”+data[i])。 } } } public static void main(string[]args){ try{ test d=new test; fun; }catch(Exception e){ System.out.println("error2") } } }
A.errorl:10.5
B.error2
C.errorl:10.5 error2
D.以上都不对
第5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6题:
Public class test ( Public static void main (String args[]) ( System.out.printIn (6 ^ 3); ) ) What is the output?()
第7题:
public class test ( public static void main(string args) { int 1= 0; while (i) { if (i==4) { break; } ++i; } } ) What is the value of i at line 10?()
第8题:
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?()
第9题:
0
3
Compilation fails.
An exception is thrown at runtime.
第10题:
第11题:
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12题:
2
4
8
16
The code will not compile.
第13题:
下面程序段的输出结果是 class Base { int i; Base() { add(1); } void add(int v) { i+=v; } void print() { System.out.println(i); } } class Extension extends Base { Extension() { add(2); } void add(int v) { i+=v*2; } } public class Test { public static void main(String args[]) { bogo(new Extension()); } static void bogo(Baseb){ b.add(8); b.print(); } }
A.9
B.18
C.20
D.22
第14题:
在下面程序的下画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15题:
下列代码的执行结果是( )。
public class Test{
public int aMethod( ){
static int i=0;
i++;
System.out.println(i):
}
public static void main (String args[]){
Trest test=new Test ( );
test aMethod( ):
}
}
A.编译错误
B.0
C.1
D.运行成功,但不输出
B.
C.
D.
第16题:
设有如下程序
public class test {
public static void main(String args[]) {
Integer intObj=Integer.valueOf(args[args.length-1]);
int i = intObj.intValue();
if(args.length >1、
System.out.println(i);
if(args.length >0)
System.out.println(i -1、;
else
System.out.println(i - 2、;
}
}
运行程序,输入如下命令:
java test 2
则输出为:
A. test
B. test -1
C. 0
D. 1
E. 2
第17题:
public class test { public static void add3 (Integer i) int val = i.intValue ( ); val += 3; i = new Integer (val); } public static void main (String args [ ] ) { Integer i = new Integer (0); add3 (i); system.out.printIn (i.intValue ( ) ); } What is the result?()
第18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.printLn (textString + textBuffer); ) ) What is the output?()
第19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?()
第20题:
public class Test {} What is the prototype of the default constructor?()
第21题:
0
1
2
Compilation fails.
第22题:
第23题:
Compilation will fail.
The program prints “0”.
The program prints “3”.
Compilation will succeed but an exception will be thrown at line 3.
第24题:
Test()
Test(void)
public Test()
public Test(void)
public void Test()