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Java String Formatting - How to add padding using String#printf()?

Java String Formatting Java 

This example shows how to do padding (i.e align text by adding spaces) with String#printf()

The format specifiers having pattern %N or %-N is used for this purpose, where N is an integer.

%N is for left padding and %-N is for right padding.

package com.logicbig.example.string;

public class StringPrintfPadding {

    public static void main(String[] args) {
        //left padding
        System.out.printf("Result: %20s%n", "test");
        //right padding
        System.out.printf("Result: %-20s%n", "test");
        System.out.printf("%-20s result%n", "test");
        //formatting multiple lines in columns
        for (int i = 7; i < 300; i += 50) {
            System.out.printf("[Product:%4s  %-4d %10f]%n", i, i * 10, i / 2f);
        }
    }
}

Output

Result:                 test
Result: test                
test                 result
[Product:   7  70     3.500000]
[Product:  57  570   28.500000]
[Product: 107  1070  53.500000]
[Product: 157  1570  78.500000]
[Product: 207  2070 103.500000]
[Product: 257  2570 128.500000]

See Also