Java String : Replace All

This section defines how to replace all character with specified character without using system methods.

Replace All method :

You can replace all specific character in a given string with another character by using String method replaceAll() or by writing your own logic.

Example : In this example we are replacing all blank spaces by the special character  ' * '. For that we have written simple logic. There is also direct method to replace all spaces by calling one of String method replaceAll("  ", "*" ). Here we are writing simple logic -

class ReplaceAll {
	public static void main(String[] args) {
		String str = "Hello world. Welcome to the wonderland.";
		String str1 = new String();
		char[] ch = str.toCharArray();
		int l = str.length();
		for (int i = 0; i < l; i++) {
			if (ch[i] == ' ') {
				ch[i] = '*';
			}
		}
		for (int i = 0; i < l; i++) {
			str1 = str1 + ch[i];
		}
		System.out.println("Orignal String : " + str);
		System.out.println("After replacing blank space to * our String : "
				+ str1);
	}
}

Output :

Orignal String : Hello world. Welcome to the wonderland.
After replacing blank space to * our String : Hello*world.*Welcome*to*the*wonderland.

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