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【单选题】如果有类Cell,请说出下列代码中,创建对象个数: public class CellGame{ public static void main(String[] args){ Cell cell = null; for(int i=0;i<20;i++){ cell = new Cell(); } } }
A.10
B.20
C.15
D.25
参考答案和解析
20
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以下代码的运行结果是______。public class exl5{public static void main(String args []){int i = 5;do{i--;if(i > 2)continue;}while(i < 0);System.out.println(i);}}
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下面程序段的输出结果是( )。 public class Test {public static void main(String args[]){ int[] a=new int[11]; int[] p=new int[4]; int k=5; for(int i= 1 ; i<= 10;i++) a[i]=i; for(int i=1 ; i<=3;i++) p[i]=a[i*i]; for(int i= 1 ;i<=3;i++) k=k+p[i]*2; System.out.println(k); }}A.37B.31C.33D.35
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下列程序打包到example包,main方法调用线程类输出0~9这10个数,请填写横线处的内容。注意:请勿改动main()主方法和其他已有语句内容,仅在横线处填入适当语句。______interface MyInterface{public abstract void print(int n);}class Mythread extends Thread ______ MyInterface{public void run(){for(int i = 0; i < 10; i++)this.print(i);}public void print(int n){System.out.print(n +" ");}}public class Example1_6{public static void main(String argv[]){Mythread th = new Mythread();______}}
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顺序执行下面的语句后,输出的结果是______。public class exl6{public static void main(String[] args){int i;int a[] = new int[10];for(i = O; i < a.length; i++)a[i] = i * 10 + j;for(i = 1; i < a.length; i++)if(a[i]%5 == O)System,out.println(a[i]);}}
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下面程序的功能是创建一个显示5个“Hello!”的线程并启动运行。请将程序补充完整。public class ThreadTest extends Thread {public static void main(String args[]) {ThreadTest t=new ______;t.start();}public void run() {int i=0;while(true) {System.out.println("Hello!");if(i++==4)break;}}}
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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 RunnableB.extends ThreadC.implements ThreadD.extends Runnable
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考题
下列程序执行后的结果是______。public class ex24{public static void main(String[] args){int j=10;a1: for(int i=3;i>0;i--){j-=i;int m=l;a2: while (m<j){if (i<=m)continue a1;j/=m++;}}System.out.println(j);}}下列嵌套的循环程序执行后,结果是______。 public class ax25 { public static void main(String[] args) { int sum=0; for(int i=0;i<=5;i++) { for(int j=10;j>3*i;j--) { sum+=j*i; } } System.out.println(sum); } }A.136B.127C.147D.153
考题
下列程序输出结果为( )。public class test { public static void main(String args[]) { int a=0; outer: for(int i=0;i<2;i++) { for(int j=0;j<2;j++) { if(j>i) { continue outer; } a++; } } System.out.println(a); }}A.0B.2C.3D.4
考题
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.0C.1D.运行成功,但不输出B.C.D.
考题
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.0C.1D.运行成功,但不输出
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( 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;i5;i++){system.out.println( " i= " +i);}}}A ) implements RunnableB ) extends ThreadC ) implements ThreadD ) extends Runnable
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public class Foo { public static void main (String args) { int i = 1; int j = i++; if ((i++j) (i++ ==j)) { i +=j; } } } What is the final value of i?() A、 1B、 2C、 3D、 4E、 5
考题
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?() A、 0B、 1C、 2D、 Compilation fails.
考题
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.printIn(j); ] } What is the result?()A、 Compilation will fail.B、 Compilation will succeed and the program will print “0”C、 Compilation will succeed and the program will print “1”D、 Compilation will succeed and the program will print “2”
考题
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?() A、 0B、 1C、 2D、 Compilation fails.
考题
单选题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?()A
0B
1C
2D
Compilation fails.
考题
单选题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.println(i.intValue()); } } What is the result? ()A
0B
3C
Compilation fails.D
An exception is thrown at runtime.
考题
单选题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?()A
0B
1C
2D
Compilation fails.
考题
单选题public class Foo { public static void main (String []args) { int i = 1; int j = i++; if ((i++j) (i++ ==j)) { i +=j; } } } What is the final value of i?()A
1B
2C
3D
4E
5
考题
单选题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.printIn(j); ] } What is the result?()A
Compilation will fail.B
Compilation will succeed and the program will print “0”C
Compilation will succeed and the program will print “1”D
Compilation will succeed and the program will print “2”
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