Remove Leading Zeros From String in Java
Given a string of digits, remove leading zeros from it.
Illustration:
Input : 00000123569 Output : 123569
Input : 000012356090 Output : 12356090
Approach: We use the StringBuffer class as Strings are immutable.
- Count leading zeros by iterating string using charAt(i) and checking for 0 at the “i” th indices.
- Converting a string into StringBuffer object as strings are immutable
- Use StringBuffer replace function to remove characters equal to the above count using replace() method.
- Returning string after removing zeros
Example:
Java
// Java program to Remove leading/preceding // zeros from a given String// Importing required classesimport java.util.Arrays;import java.util.List;// Main class// RemoveZeroclass GFG { // Method 1 // to Remove leading zeros in a string public static String removeZero(String str) { // Count leading zeros // Initially setting loop counter to 0 int i = 0; while (i < str.length() && str.charAt(i) == '0') i++; // Converting string into StringBuffer object // as strings are immutable StringBuffer sb = new StringBuffer(str); // The StringBuffer replace function removes // i characters from given index (0 here) sb.replace(0, i, ""); // Returning string after removing zeros return sb.toString(); } // Method 2 // Main driver method public static void main(String[] args) { // Sample string input String str = "00000123569"; // Calling method 1 to count leading zeroes // in above string str = removeZero(str); // Printing leading zeros inside string System.out.println(str); }} |
Output
123569
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