how to check if a string has only numbers in java

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Brayan
25 Sep 2020
1Character.isDigit(str.charAt(i));
Lukas
11 Feb 2019
1// Java program for the above approach
2// contains only digits
3class GFG {
4
5	// Function to check if a string
6	// contains only digits
7	public static boolean
8	onlyDigits(String str, int n)
9	{
10		// Traverse the string from
11		// start to end
12		for (int i = 0; i < n; i++) {
13
14			// Check if character is
15			// digit from 0-9
16			// then return true
17			// else false
18			if (str.charAt(i) >= '0'
19				&& str.charAt(i) <= '9') {
20				return true;
21			}
22			else {
23				return false;
24			}
25		}
26		return false;
27	}
28
29	// Driver Code
30	public static void main(String args[])
31	{
32		// Given string str
33		String str = "1234";
34		int len = str.length();
35
36		// Function Call
37		System.out.println(onlyDigits(str, len));
38	}
39}
40
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