Java Learning Notes (trim () and substring ())

The two functions are understood because of the fact that they have encountered the problem of OJ:

Callout input is: 4 ABC

The two types of data are separated by a space, but the method of reading only one character is not found (eats the middle space)

Trim (): Remove whitespace from the end of the string

String str= "Hello World"; str=str.trim (); // after executing the statement, the value of STR is "Hello World"

Str=str.substring (m);//intercept str from the first letter of the length of the string, the remaining string is assigned to STR;

String space= ""; String str= "Hello world"; Str=str.substring (space.length); // The value of STR after executing the statement is "Hello World"

Str=str.substring (m,n);//intercept the string from m to n at the end of STR and assign it to STR;

Java Learning Notes (trim () and substring ())