I have

String a="4:1 6:24 8:3 10:44 20:4 23:5 28:6"

How can I replace all characters after :?

In the end, I want a="4;6;8;10;20;23;28;"

I only know how to do with one

a.substring(0, a.indexOf(":")).trim()   ";"

But this code only replaces all data after :

CodePudding user response：

This should help

String a = "4:1 6:24 8:3 10:44 20:4 23:5 28:6";
String b = a.replaceAll(":[0-9]*[ ]?",";");

System.out.println(b);

Output

4;6;8;10;20;23;28;

CodePudding user response：

You can use stream API to achieve that.

String a="4:1 6:24 8:3 10:44 20:4 23:5 28:6";
String result = Arrays.stream(a.split(" "))
                      .map(s -> s.split(":")[0])
                      .collect(Collectors.joining(";"));
System.out.println(result);

Output

4;6;8;10;20;23;28

Explanation

• a.split(" ") will split string into tokens where delimiter is space
• map(s -> s.split(":")[0]) will take every token, splits it on : and return only first part
• collect(Collectors.joining(";")) will join all tokens using field separator ;