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The purpose of substring() is to intercept a part of the parent string
public String substring(int beginIndex, int endIndex)
The first parameter int is the index of the beginning, corresponding to the starting position in the String number.
The second parameter is the index position at the end, corresponding to the end position in String
1. The obtained string length is: endIndex - beginIndex;
2. Start from beginIndex, endIndex end, start from 0, which does not include characters at the endIndex position.
The code example is as follows:
package ;
public class MyClass {
public static void main(String[] args){
String test = "Hello World !";
String subTest1 = (0,3);
("subTest:" + subTest1);
String subTest2 = (0,());
("subTest:" + subTest2);
}
}
The operation results are as follows:
subTest:Hel
subTest:Hello World !
Notice:
1) The value of parameter a in substring(a,b) can start from the index value 0.
When a is equal to 0, it means it starts from the first character of the string.
That is, its substring contains the first character, of course, you can also start with other subsequent characters;2) The maximum value of parameter b in substring(a,b) can be the length of the parent string.
But it does not contain the character with the index value b.————————————————
。
Original link: /qq_37811638/article/details/82182029