This code...
public String a() {
String x = "abc";
String y = x.substring(3,3);
return y; //returns : ""
}
Works without errors but i thought there is no 3rd index for that string.As i understand indexes of strings like 1st char is 0 index ,2nd char 1 index,it goes like that.Then why is not that giving me a error like "OutOfBoundsException"?
Have a look at the code, and you will see that it does not meet the requirement for an Exception
public String substring(int beginIndex, int endIndex) {
if (beginIndex < 0) {
throw new StringIndexOutOfBoundsException(beginIndex);
}
if (endIndex > value.length) {
throw new StringIndexOutOfBoundsException(endIndex);
}
int subLen = endIndex - beginIndex;
if (subLen < 0) {
throw new StringIndexOutOfBoundsException(subLen);
}
return ((beginIndex == 0) && (endIndex == value.length)) ? this
: new String(value, beginIndex, subLen);
}
From the documentation:
IndexOutOfBoundsException - if the beginIndex is negative, or endIndex is larger than the length of this String object, or beginIndex is larger than endIndex.
None of these conditions have been met.
