Java – How to display % in String.Format?

By mkyong | Updated: March 12, 2020

Viewed: 1,018 (+8 pv/w)

Tags: format java string

This example shows you how to display a percentage % in String.format.

package com.mkyong;

public class JavaStringFormat1 {

    public static void main(String[] args) {

        String result = String.format("%d%", 100);

        System.out.println(result);

    }

}

Output

Exception in thread "main" java.util.UnknownFormatConversionException: Conversion = '%'
	at java.base/java.util.Formatter.checkText(Formatter.java:2732)
	at java.base/java.util.Formatter.parse(Formatter.java:2718)
	at java.base/java.util.Formatter.format(Formatter.java:2655)
	at java.base/java.util.Formatter.format(Formatter.java:2609)
	at java.base/java.lang.String.format(String.java:2897)

Solution

To display or escape a single %, we need to put two %%.

package com.mkyong;

public class JavaStringFormat2 {

    public static void main(String[] args) {

        String result = String.format("%d%%", 100); // 100%

        System.out.println(result);

    }

}

Output

100%

References

• Formatter JavaDoc
• Java String Format Examples