how to delete part of a string in java code example

Example 1: delete ending part of the string java

//To delete starting from "opened"
String str ="13 opened by someone";

String result = str.substring(0,str.lastIndexOf(" opened"));

Example 2: java string remove character

String str = "abcdDCBA123";
String strNew = str.replace("a", ""); // strNew is 'bcdDCBA123'