+26 형식화 클래스: Decimal Format, SimpleDateFormat, ChoiceFormat

Decimal Format

12,345,678

public static void main(String[] args) {    
    
    DecimalFormat df = new DecimalFormat();

    int data = 12345678;
    System.out.println(df.format(data));
    
}

 

 

SimpleDateFormat

2022-06-09 04:04:14

public static void main(String[] args) {    

    Date date = new Date();

    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
    System.out.println(sdf.format(date));
    
}

 

 

ChoiceFormat

100 : A
90 : A
85 : B
99 : A
45 : F
67 : D
78 : C

public static void main(String[] args) {    
    
    double[] limit = {59, 60, 70, 80, 90};
    String[] grade = {"F", "D", "C", "B", "A"};

    int[] score = {100, 90, 85, 99, 45, 67, 78};
    ChoiceFormat form = new ChoiceFormat(limit, grade);

    for(int i=0; i<score.length; i++)
    {
    System.out.println(score[i]+" : " + form.format(score[i]));	
    }
    
}