无论如何删除字符串中的指定字符？

Question

This is my code

public class StringTest {
    
    public static void main(String []args) {
            String str= "8650";
            StringBuilder build = new StringBuilder(str);
            char index = str.charAt(0);
            System.out.println(index+"");
            int indexStr= build.indexOf(index+"");
            System.out.println(indexStr);

            for( int i = 0; i < str.length(); i++) {
            if(indexStr == 0)    
            build.deleteCharAt(indexStr);
            }
           System.out.println(build);
    }
}

I want to delete thé first number if it's 0

So if I have 8650 it will print 8650, instead if I have 0650 it will print 650.

Answer 1

You have made things complicated,just use String.startsWith() and String.substring()`` can do it

public class StringTest {

    public static void main(String[] args) {
        String str = "8650";
        str = "0650";
        if (str.startsWith("0")) {
            str = str.substring(1);
        }
        System.out.println(str);
    }
}

Answer 2

Below code might help you.

    public static void main(String[] args) {

    String val = "10456";
    val = (val.charAt(0) == '0') ? val.substring(1, val.length()) : val;
    System.out.println(val);
}

Answer 3

It will remove all leading zero.

public static void main(String[] args) {
    String str = "000650";
    str = str.replaceFirst("^0*", "");
    System.out.println(str); // output 650 it will remove all leading zero
}