北京畅享互联科技有限公司

北京畅享互联科技有限公司

笔试题：

public class Test1{

String str = "good";

Public static void main(String args[]){

Test1 t = new Test1();

Char[] chars = "abc";

T.convert();

System.out.println(t.str);

System.out.println(chars);

}

Public void convert(String s,char[] ch){

S = "test ok";

Ch[0]='g';

}

}

结果是什么?

1、链表和序列哪个查询效率高，哪个修改效率高

2、共30个点，每3个点在同一个平面，求总共可以画多少个三角形

3、Class A {

Show(a(); b(); c(); d(); e(););

Public void a{System.out.println("a in A");}

Private void b{System.out.println("b in A");}

Protected void c{System.out.println("c in A");}

Public void d{System.out.println("d in A");}

Public void e{System.out.println("e in A");}

}

Class B extends A{

Show(a(); b(); c(); d(); e(););

Private void a{System.out.println("a in A");}

Public void b{System.out.println("b in A");}

void c{System.out.println("c in A");}

Protected void d{System.out.println("d in A");}

Public void e{System.out.println("e in A");}

}

Public static void main(String args[]){

B b1 = new B();

b1.show();

}

1．现在输入n个数字，以逗号，分开；然后可选择升或者降序排序；按提交键就在另一页面显示按什么排序，结果为，提供reset

import java.util.*;

public class bycomma{

public static String[] splitStringByComma(String source){

if(source==null||source.trim().equals(""))

return null;

StringTokenizer commaToker = new StringTokenizer(source,",");

String[] result = new String[commaToker.countTokens()];

int i=0;

while(commaToker.hasMoreTokens()){

result[i] = commaToker.nextToken();

i++;

}

return result;

}

public static void main(String args[]){

String[] s = splitStringByComma("5,8,7,4,3,9,1");

int[] ii = new int[s.length];

for(int i = 0;i

ii[i] =Integer.parseInt(s[i]);

}

Arrays.sort(ii);

//asc

for(int i=0;i

System.out.println(ii[i]);

}

//desc

for(int i=(s.length-1);i>=0;i--){

System.out.println(ii[i]);

}

}

}

2.paint()方法使用哪种类型的参数?

3.指出正确的表达式

A、byte=128;

B、Boolean=null;

C、long l=0xfffL;

D、double=0.9239d;

4.指出下列程序运行的结果public class Example{ String str=new String("good"); char[]ch={'a','b','c'}; public static void main(String args[]){ Example ex=new Example(); ex.change(ex.str,ex.ch); System.out.print(ex.str+" and "); Sytem.out.print(ex.ch); } public void change(String str,char ch[]){ str="test ok"; ch[0]='g'; } }

A、good and abc

B、good and gbc

C、test ok and abc

D、test ok and gbc

5.运行下列程序, 会产生什么结果

public class X extends Thread implements Runable{ public void run(){ System.out.println("this is run()"); } public static void main(String args[]) { Thread t=new Thread(new X()); t.start(); } }

11.下列代码哪几行会出错:

1) public void modify() { 2) int I, j, k; 3) I = 100; 4) while ( I > 0 ) { 5) j = I * 2; 6) System.out.println (" The value of j is " + j ); 7) k = k + 1; 8) I--; 9) } 10} }

2)

1) class Parent { 2} private String name; 3} public Parent(){} 4} } 5) public class Child extends Parent { 6} private String department; 7} public Child() {} 8} public String getValue(){ return name; } 9} public static void main(String arg[]) { 10} Parent p = new Parent(); 11} } 12} }

6.Main()方法的返回类型是?

7.System类在哪个包中?

8. 给出下面一段程序运行结果

public class X{

public static void main(String [] args){

String names[]=new String[5];

for(int x=0;x

System.out.println(names[2]);

}}

9.int i = 1;

int j;

j = i++;

i,j结果

10.哪个关键字可以抛出异常？