Java substring (basics)

    public static void main(String[] args) {

        //substring(beginIndex)
        //substring(beginIndexIncluding,endIndexExcluding);

        String s = "0123456789";
        System.out.println("'" + s.substring(0) + "'");
        System.out.println("'" + s.substring(1) + "'");
        System.out.println("'" + s.substring(10) + "'");
        System.out.println("'" + s.substring(0, 0) + "'");
        System.out.println("'" + s.substring(0, 1) + "'");
        System.out.println("'" + s.substring(0, 10) + "'");
    }

Output:
'0123456789'
'123456789'
''
''
'0'
'0123456789'

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