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单选题 设有如下程序,其调试结果为:class Q2 { public static void main(String[] args) { int[] seeds = {1,2,3,4,6,8}; int n= seeds.length; for (int i = 0; i < 3; i++) for (int k = 0; k< n-1; k++) seeds[k]= seeds[k+1]; for (int i = 0; i<n; i++) System.out.print("\t"+seeds[i]); }}
学科：[共享课]Java程序设计（华东交通大学）
时间：2023-05-08 07:13:33
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题目1单选题
假设在当前目录下无Hello.txt文件,以下程序的输出是?import java.io.*;public class Mine { public static void main(String argv[]){ Mine m = new Mine(); System.out.println(m.amethod()); } public int amethod(){ try { FileInputStream dis = new FileInputStream("Hello.txt"); } catch (FileNotFoundException fne) {System.out.println("No such file found"); return -1;} catch(IOException ioe) { } finally{System.out.println("Doing finally"); } return 0; }}A. No such file foundB. No such file found -1C. No such file found Doing finally -1D. 0
题目2单选题
哪个是事件监听者接口中方法的返回值类型A. intB. StringC. voidD. Object
题目3单选题
以下程序的输出结果为?public class Test { public static void main(String args[]) { for ( int k = 0; k < 3; k++) System.out.print("k"); } }A. 012B. kC. 0123D. kkk
题目4单选题
Java中用来定义包的关键字是A. packageB. importC. publicD. class
题目5单选题
以下代码的输出结果?public class Test{ public static void main(String argv[]){ String x="hello"; change(x); System.out.println(x); } static void change(String m){ m=m+2; }}A. helloB. hello2C. 编译报错D. 运行报错,不能将串与整数相加
题目6多选题
设有复数类ComplexNumber中含有如下方法:class ComplexNumber { private x,y; //x,y 代表复数的实部和虚部 public static ComplexNumber add(ComplexNumber a, ComplexNumber b) { return new ComplexNumber(a.x + b.x, a.y + b.y); } public ComplexNumber add(ComplexNumber a) { return new ComplexNumber(this.x + a.x, this.y+a.y); } .......}则ComplexNumber类的main方法中要将复数x,y 相加可用哪种方式A. add(x,y)B. x.add(y)C. y.add(x)D. ComplexNumber.add(x,y)
题目7单选题
执行以下代码段后, x, a,和 b的值为? 1. int x, a = 6, b = 7; 2. x = a++ + b++A. x= 15, a=7, b=8B. x= 15, a=6, b=7C. x= 13, a=7, b=8D. x= 13, a=6, b=7
题目8单选题
设有如下程序,其调试结果为:class Q2 { public static void main(String[] args) { int[] seeds = {1,2,3,4,6,8}; int n= seeds.length; for (int i = 0; i < 3; i++) for (int k = 0; k< n-1; k++) seeds[k]= seeds[k+1]; for (int i = 0; i<n; i++) System.out.print("\t"+seeds[i]); }}A. 输出: 1 2 3 4 6 8B. 输出: 4 6 8 8 8 8C. 输出: 2 3 4 6 8 8D. 输出: 2 3 4 6 6 8
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假设,x、y、z均为整形变量,且 x=1 , y=2 , z=3,则表达式 y+z--/++x 的值是A. 3B. 3.5C. 4D. 5
题目10单选题
线程在生命周期要经历5种状态,如果线程当前是新建状态,则它可到达的下一个状是A. 运行状态B. 阻塞状态C. 可运行状态D. 终止状态
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