java常见机试题目（1）

 1 package huawei;
 2 
 3 public class ChangeChar {
 4     public static char  Upper(char c)
 5     {
 6         
 7         char temp=c;
 8         if(c>=‘a‘&&c<=‘z‘)
 9         {
10             
11          temp =(char)(c-32);
12         }
13             
14             return  temp;
15             
16             
17             
18         
19     }
20     public static  String Upper(String s)
21     {
22         char temp;
23         char array[]=s.toCharArray();
24         for(int i=0;i<array.length;i++)
25         {
26             temp=s.charAt(i);
27             temp=Upper(temp);
28             array[i]=temp;
29             
30             
31         }
32         return  String.valueOf(array);
33         
34         
35     }
36 
37     public static void main(String[] args) {
38         
39         String s="hansongjiang";
40         String sBig=s.toUpperCase();
41         String lhigh="HANSONGJIANG";
42           String slittle=lhigh.toLowerCase();
43         // TODO Auto-generated method stub
44           System.out.println(sBig.equals(lhigh));
45           System.out.println(Upper("channd"));
46          
47 
48     }
49 
50 }