숫자 천 단위 콤마 추가

NumberFormat으로 간단하게 해결

 

 

▷ Example

 

    public void test() {
        int number01 = 1000000000;
        int number02 = 100;
        String number03 = "1000";
        
        System.out.println(number01); // 1000000000
        System.out.println(number02); // 100
        System.out.println(number03); // 1000        
        
        // NumberFormat.getInstance().format(숫자)
        String commaNum01 = NumberFormat.getInstance().format(number01);
        String commaNum02 = NumberFormat.getInstance().format(number02);
        String commaNum03 = NumberFormat.getInstance().format(Integer.parseInt(number03));
        
        System.out.println(commaNum01); // 1,000,000,000
        System.out.println(commaNum02); // 100
        System.out.println(commaNum03); // 1,000
    }