如何从java中的griven字符串中提取子字符串

Question

How to I extract the following substring from a string in Java.

string var=fill x [0,4,4,4] #1000ff

I want to extract only the fill x (with whitespaces).

Can anyone help me out?

Answer 1

尝试这个：

String result = var.substring(0,var.indexOf("["));

Answer 2

String subString = var.substring(begin, end + 1);  
// begin and end is the integer index of var string where you want to get

in your example, it should be:

String subString = var.substring(0, var.indexOf("["));  // if include white space
String subString = var.substring(0, var.indexOf("x") + 1);  // if not include white space