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Check whether the String contains only digit characters in Java
The following is our string.
String str = "4434";
To check whether the above string has only digit characters, try the following if condition that uses matches() method and checks for every character.
if(str.matches("[0-9]+") && str.length() > 2) {
System.out.println("String contains only digits!");
}Example
public class Demo {
public static void main(String []args) {
String str = "4434";
if(str.matches("[0-9]+") && str.length() > 2) {
System.out.println("String contains only digits!");
}
}
}Output
String contains only digits!
Let us see another example.
Example
public class Demo {
public static void main(String []args) {
String str = "5demo9";
System.out.println("String: "+str);
if(str.matches("[0-9]+") && str.length() > 2) {
System.out.println("String contains only digits!");
} else {
System.out.println("String contains digits as well as other characters!");
}
}
}Output
String: 5demo9 String contains digits as well as other characters!
Updated on: 27-Jun-2020
877 Views
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