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Remove Leading Zeros From String in Java

  • Difficulty Level : Easy
  • Last Updated : 08 May, 2019

Given a string of digits, remove leading zeros from it.


Input : 00000123569
Output : 123569

Input : 000012356090
Output : 12356090

We use StringBuffer class as Strings are immutable.

1) Count leading zeros.
2) Use StringBuffer replace function to remove characters equal to above count.

// Java program to remove leading/preceding zeros
// from a given string
import java.util.Arrays;
import java.util.List;
/* Name of the class to remove leading/preceding zeros */
class RemoveZero
    public static String removeZero(String str)
        // Count leading zeros
        int i = 0;
        while (i < str.length() && str.charAt(i) == '0')
        // Convert str into StringBuffer 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, "");
        return sb.toString();  // return in String
    // Driver code
    public static void main (String[] args)
        String str = "00000123569";
        str = removeZero(str);



Remove leading Zeros From string in C++

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