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Remove Leading Zeros From String in Java

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

Examples:

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 (str.charAt(i) == '0')
            i++;
  
        // 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);
        System.out.println(str);
    }
}

Output:

123569

Remove leading Zeros From string in C++

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.



This article is attributed to GeeksforGeeks.org

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