StringBuffer append() in Java

append(): This method is available in java.lang.StringBuffer class of Java.

Appends the string representation of the Object argument. The overall effect is exactly as if the argument were converted to a string by the method.

Parameters: obj an Object. 

Returns: a reference to this object.

For Example:

The object is of any type like boolean, char, char array, CharSequence, double, float, int, long, String, and StringBuffer.

Approach

Java

public class AppendStringBuffer {
    public static void main(String[] args) {

        StringBuffer str = new StringBuffer();

        // append the boolean value
        str.append(false);

        System.out.println("After boolean = " + str);

        // append the char value
        str.append('a');
        System.out.println("After char = " + str);

        //// append the char array
        char arr[] = { 'a', 'b' };
        str.append(arr);
        System.out.println("After char array = " + str);

        // append the CharSequence value
        CharSequence s = "abc";
        str.append(s);
        System.out.println("After CharSequence = " + str);

        // append the double value
        double d = 16.78;
        str.append(d);
        System.out.println("After double = " + str);

        // append the float value
        float f = 12.34f;
        str.append(f);
        System.out.println("After float = " + str);

        // append the int value
        int i = 5;
        str.append(i);
        System.out.println("After int = " + str);

        // append the long value
        long lng = 1999191;
        str.append(lng);
        System.out.println("After long = " + str);

        // append the String value
        String str1 = "Hello";
        str.append(str1);
        System.out.println("After String = " + str);

        // append the StringBuffer value
        StringBuffer sb = new StringBuffer("World");
        str.append(sb);
        System.out.println("After StringBuffer = " + str);

    }
}

Output:

After boolean = false
After char = falsea
After char array = falseaab
After CharSequence = falseaababc
After double = falseaababc16.78
After float = falseaababc16.7812.34
After int = falseaababc16.7812.345
After long = falseaababc16.7812.3451999191
After String = falseaababc16.7812.3451999191Hello
After StringBuffer = falseaababc16.7812.3451999191HelloWorld