最新软通动力java笔试题目

  一、选择题

  1、下面哪些是java语言中的关键字? A sizeof B abstract C NULL D Native 答:B

  2、下面语句哪个是正确的? A char='abc'; B long l=oxfff; C float f=0.23; D double=0.7E-3; 答:D

  3、以下程序测试String 类的各种构造方法,试选出其运行效果。

  public class abc {

  public static void main(String args[]){

  String s1=new String();

  String s2=new String("String 2");

  char chars[]={'a',' ','s','t','r','i','n','g'};

  String s3=new String(chars);

  String s4=new String(chars,2,6);

  byte bytes[]={0,1,2,3,4,5,6,7,8,9};

  StringBuffer sb = new StringBuffer(s3);

  String s5=new String(sb);

  System.out.println("The String No.1 is "+s1);

  System.out.println("The String No.2 is "+s2);

  System.out.println("The String No.3 is "+s3);

  System.out.println("The String No.4 is "+s4);

  System.out.println("The String No.5 is "+s5);

  }

  }

  A The String No.1 is

  The String No.2 is String 2

  The String No.3 is a string

  The String No.4 is string

  The String No.5 is a string

  B The String No.1 is  The String No.2 is String 2  The String No.3 is a string

  The String No.4 is tring  The String No.5 is a string

  C The String No.1 is  The String No.2 is String 2  The String No.3 is a string

  The String No.4 is strin  The String No.5 is a string

  D 以上都不对

  答:A

  4、下面语句段的输出结果是什么?

  inti = 9; switch (i) {

  default: System.out.println("default");

  case 0: System.out.println("zero"); break;

  case 1: System.out.println("one");

  case 2: System.out.println("two"); }

  A default

  B default, zero

  C error default clause not defined

  D no output displayed

  答:B

  二、不定项选择题(在每小题的五个备选答案中选出正确答案,并将正确答案的序号填入题干后面的括号内,错选多选,漏选均不得分。)

  1、给出如下代码:

  class Test{ private int m; public static void fun() { // some code... } } 如何使成员变量m 被函数fun()直接访问?

  A、将private int m 改为protected int m B、将private int m 改为 public int m

  C、将private int m 改为 static int m D、将private int m 改为int m

  答: C

  2、下面哪几个函数是public void example(){...}的重载函数?

  A、 public void example( int m){...} B、public int example(){...}

  C、public void example2(){...} D、 public int example ( int m, float f){...}

  答: A,D

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