/**
* 项目名称：
* 文件说明： ExCEL公式类型：字符串公式
* 主要特点：
* 版本号：1.0
* 制作人：刘晨曦
* 创建时间：-12-3
**/
package EXCEL;
/**
* @author lcx
*
*/
public class StringFunctions {
public static String right(String str,int len)
{
if(len>str.length())
throw new IllegalArgumentException("截取长度不能大于数组长度");
return str.substring(str.length()-len, str.length());
}
public static String left(String str,int len)
{
if(len>str.length())
throw new IllegalArgumentException("截取长度不能大于数组长度");
return str.substring(0, len);
}
public static String mid(String str,int start,int len)
{
if(start+len-1>str.length())
throw new IllegalArgumentException("截取越限");
return str.substring(start-1, start+len-1);
}
public static int len(String str)
{
if(str==null)
return 0;
return str.length();
}
public static String concatenate(String...strs)
{
StringBuffer buffer=new StringBuffer();
for(String str:strs)
buffer.append(str);
return buffer.toString();
}
public static boolean exact(String str1,String str2)
{
return str1.equals(str2);
}
public static String upper(String str1)
{
if(str1==null)
return "";
return str1.toUpperCase();
}
public static int find(String find_text,String within_text,int start_num)
{
if(start_num<=0||start_num>within_text.length())
throw new IllegalArgumentException("start_num参数输入问题");
if(find_text.length()>within_text.length())
return -1;
String tag=within_text.substring(start_num-1);
int index=tag.indexOf(find_text);
if(index<0)
return -1;
return index+start_num;
}
public static void main(String[] args) {
/*******************测试字符串*****************************/
System.out.println(mid("我想要编程",2,2));
System.out.println(left("我想要编程",2));
System.out.println(right("我想要编程",3));
System.out.println(concatenate("a","b","c","d"));
System.out.println(exact(new String("aaa"),new String("aaa")));
System.out.println(upper("aaaa"));
System.out.println(find("b","abcabc",3));
}
}
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