java全角半角转换程序

public class change { 

public static void main(String[] args) { 

String QJstr="全角转半角ＤＡＯ"; 

String result=SBCchange(QJstr); 

System.out.println(QJstr+"\n"+result); 

} 

public static final String SBCchange(String QJstr) 
{ 
String outStr=""; 
String Tstr=""; 
byte[] b=null; 

for(int i=0;i<QJstr.length();i++) 
{ 
try 
{ 
Tstr=QJstr.substring(i,i+1); 
b=Tstr.getBytes("unicode"); 
} 
catch(java.io.UnsupportedEncodingException e) 
{ 
e.printStackTrace(); 
} 

if (b[3]==-1) 
{ 
b[2]=(byte)(b[2]+32); 
b[3]=0; 

try 
{ 
outStr=outStr+new String(b,"unicode"); 
} 
catch(java.io.UnsupportedEncodingException e) 
{ 
e.printStackTrace(); 
} 
}else outStr=outStr+Tstr; 
} 

return outStr; 
} 

} 







public class Test { 
public static void main(String[] args) { 
String QJstr = "hello";