第七周技术博客

/**
this is a class to deal with String, its provided with Trim, reverse etc
@author Lu Shan
@version v1.8

*/

public class StrTool
{
/**
trim: to remove the spaces on the two sides of the String
@param temp to get a String
@return return the new String
*/
public static String myTrim(String temp)
{
int i=0;
while(temp.charAt(i)==' ')
{
i++;
}
int start=i;
i=temp.length()-1;
while(temp.charAt(i)==' ')
{
i--;
}
int end=i;
String s = temp.substring(start,end+1);
return s;
}
/**
reverse temp from index i to index j
@param temp to get a String
@param i to get the start index
@param j to get the end index
@return to return the reversed String
*/
public static String reverse(String temp,int i,int j)
{
char[] arr= temp.toCharArray();
char mid;
int m= j-1;
for(int n=i;n<j;n++)
{
mid = arr[n-1];
arr[n-1]=arr[m];
arr[m--]=mid;
}
String s = String.valueOf(arr);
return s;
}
/**
return the times a str showed in another str
@param t1 to get the longer String
@param t2 to get the shorter String
@return to return the times t2 shown in t1
*/
public static int timesShow(String t1,String t2)
{
int num=-1;
int index=0;
while (index!=-1)
{
num++;
if (num>=1) {
index=t1.indexOf(t2,t2.length()+index);
}
else
{
index=t1.indexOf(t2,index);
}
}
return num;
}
/**
find the greatest substring of str1 in str2 ever existed
@param str1 to get the longer String
@param str2 to get the shorter String
@return to return the largest substring of str2 in str1
*/
public static String minorStr(String str1,String str2)
{
String temp;
if(str1.contains(str2))
return str2;
int start=0;
int end=str2.length()-1;
int sublength=str2.length()-1;

while (sublength!=0)
{
for(;end<=str2.length();start++,end++)
{
char[] arr = str2.toCharArray();
if(str1.contains(str2.substring(start,end)))
return str2.substring(start,end);
}
sublength--;
start=0;
end=sublength;

}
return "";

}
/**
System.out.println();
@param temp to get the thing to be printed
*/
public static void sop(Object temp)
{
System.out.println(temp);
}
}

/*
class StrToolDemo
{
public static void main(String[] args) {
String str1 = "lushan in the house do you know that";
// String str2 = StrTool.myTrim(str1);
// StrTool.sop(str2);
// String str2 = StrTool.reverse(str1,2,4);
//int num1 = StrTool.timesShow(str1,"lu");
String str2 = "in the house";
String str3 = StrTool.minorStr(str1,str2);
StrTool.sop(str3);
}
}
*/