Check out example codes for "append in java". It will help you in understanding the concepts better.

Code Example 1

public StringBuilder append(boolean a)

Code Example 2

// Java program to illustrate the 
// StringBuilder append(boolean a) 
import java.lang.*; 
  
public class Geeks { 
  
    public static void main(String[] args) 
    { 
  
        StringBuilder sb1 = new 
                      StringBuilder("Welcome to Geeksforgeeks "); 
        System.out.println("Input: " + sb1); 
  
        // Appending the boolean value 
        sb1.append(true); 
        System.out.println("Output: " + sb1); 
  
        System.out.println(); 
  
        StringBuilder sb2 = new StringBuilder("We fail- "); 
        System.out.println("Input: " + sb2); 
  
        // Appending the boolean value 
        sb2.append(false); 
        System.out.println("Output: " + sb2); 
    } 
}

Learn ReactJs, React Native from akashmittal.com