remove certain chars from string java code example

Example 1: how to remove all special characters from a string in java

String str= "This#string%contains^special*characters&.";   
str = str.replaceAll("[^a-zA-Z0-9]", " ");  
System.out.println(str);

Example 2: java string remove character

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