以下程序的运行结果为:public class A {static int k=3;public static void main(String[] args) {int k=4;A x1=new A();x1.k++;A x2=new A();x2.k++;k++;System.out.println(x1.k);}}
A. 3
B. 4
C.5
D.6
E.7
A. 3
B. 4
C.5
D.6
E.7
A. 输出结果为 0
B. 运行出错
C. 输出结果为 null
D. 编译错误
A. 3
B. 4
C. 5
D. 6
E. 语句if(i= 2、编译出错
阅读下列程序,请写出程序的运行结果。
import java.applet.*;
import java.awt.*;
public class C extends Applet implements Runnable
{
Thread redBall,blueBall;
Graphics redPen,bluePen;
int blueSeta=0,redSeta=0;
public void init()
{
setSize(250,200);
redBall=new Thread(this);
blueBall=new Thread(this);
redPen=getGraphics();
bluePen=getGraphics();
redPen.setColor(Color.red);
bluePen.setColor(Color.blue);
setBackground(Color.gray);
}
public void start()
{
redBall.start();
blueBall.start();
}
public void run()
{
intx,y;
while(true)
{
if(Thread.currentThread()==redBall)
{//以下代码为顺时针画圆
x=(int)(80.0*Math.cos(3.1415926/180.0*redSeta));
y=(int)(80.0*Math.sin(3.1415926/180.0*redSeta));
redPen.setColor(Color.gray);
redPen.fillOval(100+x,100+y,10,10);
redSeta+=3;
if(redSeta>=360)redSeta=0;
x=(int)(80.0*Math.cos(3.1415926/180.0*redSeta));
y=(int)(80.0*Math.sin(3.1415926/180.0*redSeta));
redPen.setColor(Color.red);
redPen.fillOval(100+x,100+y,10,10);
try{redBall.sleep(20);}
catch(InterruptedException e){}
}
elseif(Thread.currentThread()==blueBall)
{//以下代码为顺时针画圆
x=(int)(80.0*Math.cos(3.1415926/180.0*blueSeta));
y=(int)(80.0*Math.sin(3.1415926/180.0*blueSeta));
bluePen.setColor(Color.gray);
bluePen.fillOval(150+x,100+y,10,10);
blueSeta-=3;
if(blueSeta<=-360)blueSeta=0;
x=(int)(80.0*Math.cos(3.1415926/180.0*blueSeta));
y=(int)(80.0*Math.sin(3.1415926/180.0*blueSeta));
bluePen.setColor(Color.blue);
bluePen.fillOval(150+x,100+y,10;10);
try{blueBall.sleepp(40);}
catch(InterruptedException e){}
}
}
}
}
class A
{
int a;
A(int b)
{a=b;}
void show()
{System.out.println(“a=”+a);}
}
public class Class1
{
public static void main (String args[])
{
A bj=new A(12345);
boolean b=false;
char ch=97;
obj.show();
System.out.println(“b=”+b+”/tch=”+ch);
}
}
下面程序的运行结果为()。 #include<iostream.h> class A { int num public: A(int i){num=i;} A(A&a){Bum=a.num++;} void print(){cout<<Bum;} }; void main() { A a(1),b(a); A. print(); B.print(); }
A.11
B.12
C.21
D.22
以下的程序的调试结果为?
public class As{
int i = 10;
int j;
char z= 1;
boolean b;
public static void main(String argv[]){
As a = new As();
A.amethod();
}
public void amethod(){
System.out.println(j);
System.out.println(b);
}
}
A.输出0 和false
B. 输出0 和true
C. 编译错误,b 未初始化
D. 编译错误, z 必须赋字符值
[Java代码]
行号 代码
01 public class UainJava{
02 public static void main(String[]args){
03 SuperClass s=new SubClass();
04 System.out.printin(s.getValue());
05 System.out.printIn(s.getSum()):
06 }
07 }
08 abstract class SuperClass {
09 private int i;
10 public SuperClass(){i=5;}
11 public int getValue(){
12 return i:
13 }
14 public final abstract int getSum():
15 }
16 class SubClass extends SuperClass{
17 int j;
18 public SubClass(){
19 this(-3);
20 }
21 public SubClass(int j){
22 (1) .j=j;
23 }
24 publiC int getValue()(return j;}
25 public int getSum(){
26 return (2) .getValue()+j;
27 }
28
A.编译失败
B.编译通过,没有结果输出
C.输出:除法正常运行
D.输出:除数不能为0
阅读下列程序,请写出程序的运行结果。
import java.applet.*;
import javax.swing.*;
import java.awt.event.*;
public class C extends Applet implements ActionListener
{
int n=0;
JButton button;
public void init()
{
setSize(400,100);
button=new JButton("");
add(button);
button.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{
n++;
button.setText(n+"");
}
}
阅读下列程序,写出程序运行结果。
import j ava. util. StringTokenizer;
public class C3301
{
public static void main(String[] args)
{
String ss="public static void main";
StringTokenizer pas=new StringTokenizer(ss, " ") ;
int n=pas. countTokens() ;
System. out. println(n) ;
String s=pas. nextToken() ;
for(pas. nextToken() ; pas. hasMorcTokens() ; s=pas. nextToken()
System. out. println(s) ;
}
}