从字符串中删除设置的子字符串

Question

I need to delete the set substring from string in Java. How I can to do it? example:

string st1="The end of the text"; string st2="end of the ";

result:
st1="The text".

Answer 1

You can do this:

String newString = st1.replace(st2, "");

// String newString2 = st1.replaceAll(st2, ""); Alternative
// String newString3 = st1.replaceFirst(st2, ""); Alternative 2

However, your question smell homework so you should add that tag on future questions if this is true.

Java String documentation

Answer 2

以下是您想要的吗？

str1 = st1.replace(st2,"");

Answer 3

If you want to use substring() , you can do it like this:

public static String getCustomString(String s1, String s2)
{
    if(s1.length() >= s2.length())
    {
        if(s1.contains(s2))
            return s1.substring(0, s1.indexOf(s2)) + s1.substring(s1.indexOf(s2) + s2.length());
    }
    else
    {
        if(s2.contains(s1))
            return s2.substring(0, s2.indexOf(s1)) + s2.substring(s2.indexOf(s1) + s1.length());
    }
    return "";
}

Answer 4

If homework (with minimal usage of Java API calls:

public void subString(String st1, String st2) {

   int s2len = st2.length();
   int s1len = st1.length();

   int i = 0;
   int count = 0;
   while(i <= st1.length() && i+st2.length() <= st1.length()) {

       if (st1.substring(i, i+st2.length()).equalsIgnoreCase(st2)) {
          st1 = (i > 0? st1.substring(0, i) : "") + st1.substring(i+st2.length());
          i=0;
       }
       else {
          i++;
       }
   }
   System.out.println(st1);
}

Otherwise:

st1.replace(st2, "");