How to use replace function in java

The replace() function in Java is used to replace characters or substrings in a string. There are two forms: replacing all matching characters and replacing a specific number of matching characters. Returns a new string after replacement, the original string is unaffected. Parameters include: characters/substrings to replace, characters/substrings to replace, and (optional) the maximum number of times to replace.

Usage of replace() function in Java

replace() in Java Function used to replace characters or substrings in a string. It has two forms:

1. Replace all matching characters

<code class="java">String result = string.replace('a', 'b');</code>

In this example, all 'a's in string characters will be replaced with 'b'.

2. Replace a specific number of matching characters

<code class="java">String result = string.replace('a', 'b', 2);</code>

In this example, the first two 'a' characters in string will be Replace with 'b'. If the specified value is less than 0, all matching characters are replaced.

Usage:

• Return type: A new string after replacement, the original string is not affected.

• Parameters:

  • oldChar/oldString: The character or substring to be replaced.
  • newChar/newString: Replaced character or substring.
  • (optional) max: The maximum number of times to replace, default is all matches.
• Example:

<code class="java">String s = "Hello World!";

// 替换所有 'o' 为 'e'
System.out.println(s.replace('o', 'e'));

// 替换前两个 'l' 为 'x'
System.out.println(s.replace('l', 'x', 2));

// 替换 "World" 为 "Universe"
System.out.println(s.replace("World", "Universe"));</code>

Output:

<code>Helle Werld!
Hexplo Werld!
Hello Universe!</code>

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