String.replace vs String.replaceAll

replace() method

'replace' method takes pair of characters or pair of CharSequences and return a string by replacing every occurrence of char or CharSequence with  newChar or newCharSequence

Signature

public String replace(CharSequence target, CharSequence newCharSequence)

public String replace(char oldChar, char newChar)

App.java

package com.sample.app;

public class App {

 public static void main(String args[]) {
  String str1 = "You're braver than you believe, and stronger than you seem, and smarter than you think.";

  String str2 = str1.replace("and", "->");
  String str3 = str1.replace('b', 'B');

  System.out.println("str1 : " + str1);
  System.out.println("str2 : " + str2);
  System.out.println("str3 : " + str3);

 }

}

Output

str1 : You're braver than you believe, and stronger than you seem, and smarter than you think.
str2 : You're braver than you believe, -> stronger than you seem, -> smarter than you think.
str3 : You're Braver than you Believe, and stronger than you seem, and smarter than you think.

replaceAll method

'replaceAll' method takes a regular expression and replacement string as arguments and return a string by replacing each substring of this string that matches the given regular expression.

Signature

public String replaceAll(String regex, String replacement)

App.java

package com.sample.app;

public class App {

 public static void main(String args[]) {
  String str1 = "You're braver than you believe, and stronger than you seem, and smarter than you think.";

  String str2 = str1.replaceAll(".o.", "###");

  System.out.println("str1 : " + str1);
  System.out.println("str2 : " + str2);

 }

}

Output

str1 : You're braver than you believe, and stronger than you seem, and smarter than you think.
str2 : ###'re braver than ### believe, and st###ger than ### seem, and smarter than ### think.

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