I do not really understand how the substring method works. Does the index start at 0? If I start with 0, e is at index 4 but char i is at 7 so the output would be ersi .

“Substring creates a new object out of source string by taking a portion of original string”. Until Java 1.7, substring holds the reference of the original character array, which means even a sub-string of 5 characters long, can prevent 1GB character array from garbage collection, by holding a strong reference.

Oct 16, 2013 · Java's substring inputs, public String substring(int beginIndex,int endIndex) beginIndex - the beginning index, inclusive. endIndex - the ending index, exclusive. Note the exclusive. substring(0,1) will return a string including character 0, up to …

Feb 18, 2017 · Method Name: substring(int firstIndex, int lastIndex) Description: Returns the part of this String from the character at firstIndex to the character at lastIndex - 1 (inclusive). You can extract the String portion you want with the following code (that portion is saved to the stringExcerpt variable):

May 31, 2012 · Also, when doing String s = "Hello, World".substring(0,5); think about the order of operations. First the string "Hello, World" will be created on the heap and a brand new String object will point at it. Then the substring method will be called on the new String object and another new String object created and pointed at by the s instance.

I have a string: /abc/def/ghfj.doc I would like to extract ghfj.doc from this, i.e. the substring after the last /, or first / from right. Could someone please provide some help?

Apr 19, 2013 · Starting from Java 7, substring will not share the characters, but will create a new one. So, total object count will be 4 - the last one will be created with the concatenation of the two substrings. Edit To answer your question in the comment, take a …

Mar 6, 2015 · text1.substring(int1, int2); text2.substring(int1, int2); text3.substring(int1, int2); that would return abc(the first 3 characters) the problem is that the strings length is always changing, so i can't use text1.length no matter what.

Well, so many right answers together in that less time. Thanks a lot to you all. You saved my a lot of time. I am using java 1.5 and I was looking at the documentation of java 1.4.2 therefore I didn't realize that there exists the method "contains". The subindexing approach is also OK. +1 to …

Strings in Java are immutable to so you need to store return value of thereplace method call in another String. You don't really need a regex here, just a simple call to String#replace(String) will do the job. So just use this code: String replaced = string.replace("abcd", "dddd");