How to Left-Pad a String with Zeros in Java?
Left Padding a String with Zeros in Java
Similar inquiries have been discussed in the past, but there remains some ambiguity regarding the technique for left padding a string with zeros. Specifically, let's aim to achieve the following transformation:
Input: "129018"
Output: "0000129018"
The final output should consist of exactly ten characters.
Numeric Strings
For strings containing only numeric characters, a simple approach is to convert the string to an integer and then use the String.format method to apply left padding:
String input = "129018";
int number = Integer.parseInt(input);
String padded = String.format("%010d", number);Non-Numeric Strings
For non-numeric strings, alternative approaches are required:
String Concatenation
You can concatenate the required number of zeros to the beginning of the string:
String input = "abc";
StringBuilder padded = new StringBuilder();
int paddingLength = 10 - input.length();
for (int i = 0; i < paddingLength; i++) {
padded.append('0');
}
padded.append(input);Substring Replacement
You can replace a substring of the appropriate length at the beginning of the string with zeros:
String input = "abc";
String padded = String.format("%10s", input).replaceFirst(" ", "0");StringBuilder Transformation
You can create a StringBuilder from the existing string and insert zeros at the beginning:
String input = "abc";
StringBuilder padded = new StringBuilder(input);
for (int i = 0; i < 10 - input.length(); i++) {
padded.insert(0, '0');
}The above is the detailed content of How to Left-Pad a String with Zeros in Java?. For more information, please follow other related articles on the PHP Chinese website!
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