2020计算机二级考试Java强化练习题及答案012

1.下列选项成员变量声明正确的是( )。

A.public protected final int i;

B.abstract class Fl{…}

C.private double height;

D.double weight()

答案：C

2.下面程序段的输出结果是( )。

class Test{

public s，tatic void main(String args[]){

MyThread t=new MyThread();

t.displayOutput("t has been createD");

t.start();

}

}

Class MyThread extends Thread{

public void displayOutput(String s){

System.out.println(s);

}

public void run(){

displayOutput("t is running.");

}

}

A.t has been created.

B.t has been created. t is running.

C.t is running.

D.编译出错

答案：B

3.执行下列程序时，会产生什么异常( )。

public class Test{

public static void main(String args[]){

int d=101;

int b=220：

long a=321;

System.OUt.println((a-b)/(a-b-d));

}

}

A.ArraylndexOutOfBoundsException

B.NumberFormatException

C.ArithmeticException

D.EOFExeeption

答案：C

4.下面程序段的输出结果为( )。

public class Test

{

public static void main(String args[])

{

booleana，b，C;

a=(3<5)：

b=(a= =true);

System.out.println("a="+a+"b="+b);

c=(b= =false);

System.out.println("b="+b+"c="+c);

}

}

A.a=true b=false

b=true c=true

B.fl=true b=false

b=true c=false

C.a=true b=true

b=true c=false

D.a=false b=false

b=true c=false

答案：C

5.下面程序段的输出结果是( )。

public class Test{

public static void main(String args[]){

int a，b;

for(a=1，b=1;a<=100;a++){

if(b>=10)break;

if(b%2= =1){

b+=2：

continue;

}

}

System.OUt.println(a);

}

}

A.5

B.6

C.7

D.101

答案：B