@@ -4,16 +4,16 @@ title: "Java Program To Check If the given String Is A Number or Not"
44author : gaurav
55categories : [Java Programs, Core Java]
66toc : true
7- description : " In this tutorial, we will see a Java program to check if the given String is number or not."
7+ description : " In this tutorial, we will see a Java program to check if the given String is a number or not."
88---
99
10- In this tutorial, we will see a Java program to check if the given String is number or not.
10+ In this tutorial, we will see a Java program to check if the given String is a number or not.
1111
1212We can check it using the regex expression.
1313
1414## Java Program To Check If the Given String is Number or Not Using Regex Expression
1515
16- In the below program we have simply used the regex expression to check whether the given string is numeric or not.
16+ In the below program, we have simply used the regex expression to check whether the given string is numeric or not.
1717
1818The regex expression to check this is ` -?\\d+ `
1919
2929import java.util.List ;
3030
3131/**
32- * A Java program to check if the given String is number of not.
32+ * A Java program to check if the given String is a number or not.
3333 * @author coderolls.com
3434 */
3535public class CheckIfNumber {
@@ -48,8 +48,8 @@ public class CheckIfNumber {
4848 }
4949
5050 /**
51- * A method check if the input param string is a numeric or not
52- * it is uses a regex Expression
51+ * A method checks if the input param string is numeric or not
52+ * It uses a regex Expression
5353 * -? --> negative sign, could have none or one
5454 * \\d+ --> one or more digits
5555 * @param str
@@ -76,15 +76,15 @@ The String 'Google' is not a Number.
7676
7777## Java Program To Check If the Given String is Number or Not Using the ` Character.isDigit() ` method
7878
79- In this method we are iterating over an array of characters of the String and checking if any character is a digit or not.
79+ In this method, we are iterating over an array of characters of the String and checking if any character is a digit or not.
8080
81- If we found one or more digit in the string, the given string is not a number string or a number.
81+ If we find one or more digits in the string, the given string is not a number string or a number.
8282
8383``` Java
8484import java.util.List ;
8585
8686/**
87- * A Java program to check if the given String is number of not.
87+ * A Java program to check if the given String is a number or not.
8888 * using the Character.isDigit() method.
8989 * @author coderolls.com
9090 */
@@ -104,8 +104,8 @@ public class CheckIfNumber2 {
104104 }
105105
106106 /**
107- * A method check if the input param string is a numeric or not
108- * it is uses a regex Expression
107+ * A method checks if the input param string is numeric or not
108+ * It uses a regex Expression
109109 * -? --> negative sign, could have none or one
110110 * \\d+ --> one or more digits
111111 * @param str
@@ -124,7 +124,7 @@ public class CheckIfNumber2 {
124124 return false ;
125125 }
126126 }
127- // If not a single ch is digit, the string is numeric
127+ // If not a single ch is a digit, the string is numeric
128128 return true ;
129129 }
130130}
@@ -169,4 +169,4 @@ public static boolean isInteger(String s) {
169169}
170170```
171171
172- ** But this way is not recommended as it causes expensive exception in the code.**
172+ ** But this way is not recommended as it causes expensive exceptions in the code.**
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