JDK 12 introduced indent() method in Java.lang.String class. This method is useful to add or remove white spaces from the beginning of the line to adjust indentation for each string line.
Syntax:
public String indent(int n)
Parameter: It takes integer n as input and does indentation accordingly.
Also, each line is suffixed with “\n” (a newline character).
Procedure:
When a string is provided to indent() method,
- It calls lines() function
- Then, for each line, does indentation based on integer value provided as per user cases discussed below:
- If n>0 (Positive)
- Then n white spaces are added at the starting of each line and each line is suffixed with “\n”.
- If n==0
- Then the indentation remains as it is, only line is suffixed with “\n”.
- If n<0 (Negative), then
- If (+n) > leading white spaces available
- Then all leading white spaces are removed for each line and each line is suffixed with “\n”
- If (+n) < leading white spaces available
- Then (+n) leading white spaces are removed for each line and each line is suffixed with “\n”
- If (+n) > leading white spaces available
- If n>0 (Positive)
- Then, suffix each line with “\n”.
- Then, concatenates resulting string lines and returns
Implementation:
Example 1
Java
// Java Program to illustrate indent() method of// String class// Importing basic librariesimport java.io.*;import java.util.*;// Class for indent() methodpublic class GFG { // Main driver method public static void main(String args[]) { // Custom input string String input = "Lazyroar\nA Computer Science portal for geeks."; // Print and display the input string System.out.println(input); // Print the above string length // using standard length() method System.out.println("Input String length: " + input.length()); // Now, calling the indent() method // for random value of N // Case 1: N>0 | Positive // Say N = 5 which is positive // so as per procedural algorithm // 5 white spaces are added // at the starting of each line String output = input.indent(5); // Print and display output string System.out.println(output); // Print the new string length // again using the length() method System.out.println("New String length: " + output.length()); // Case 2: N=0 | Zero // Call indent method with n=0 String output1 = input.indent(0); System.out.println(output1); System.out.println("New String length: " + output1.length()); // Case 3: N < 0 | Negative // Call indent method with n=-3 (negative) String output2 = input.indent(-3); // Print the output string System.out.println(output); // Print output(new) string length System.out.println("New String length: " + output2.length()); }} |
Output:
Lazyroar
A Computer Science portal for geeks.
Input String length: 50
Lazyroar
A Computer Science portal for geeks.
New String length: 61
Lazyroar
A Computer Science portal for geeks.
New String length: 51
Lazyroar
A Computer Science portal for geeks.
New String length: 51
Example 2:
Java
// Java Program to illustrate indent() method of// String class// Importing basic librariesimport java.util.*;import java.io.*;// Class for indent() methodpublic class GFG { // Main driver method public static void main(String args[]) { // Input string String input = "Lazyroar"; System.out.println(input); System.out.println("Input String length: " + input.length()); // Call indent method on input string with n=5 // (positive) String output = input.indent(5); System.out.println(output); System.out.println("New String length: " + output.length()); // Call indent method on output string with n=0 String output1 = output.indent(0); System.out.println(output1); System.out.println("New String length: " + output1.length()); // Call indent method on output1 string with n=-3 // (negative) String output2 = output.indent(-3); System.out.println(output2); System.out.println("New String length: " + output2.length()); }} |
Output:
Lazyroar
Input String length: 13
Lazyroar
New String length: 19
Lazyroar
New String length: 19
Lazyroar
New String length: 16
