180423 String Conv , StringConvDate

package wrap;

/*

 * String -> 기본데이터형으로 변환 

 * 기본데이터형 -> String

 * 작성자 작성내용 작성일자 

 */

public class StringConv {

public static void main(String[] args) {

String a = "100";

int i = Integer.parseInt(a);

long l = Long.parseLong(a);

double e = Double.parseDouble(a);

a = Integer.toString(i);

a = Long.toString(l);

a = Double.toString(e);

}

}

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package wrap;

/*

 * 

 * String <-> Date

 * 

 */

import java.util.Calendar;

import java.util.Date;

public class StringConvDate {

public static void main(String[] args) {

 

//Date, Calendar

Date today = new Date();

System.out.println(today);

Calendar today1 = Calendar.getInstance();

System.out.println(today1);

System.out.println("year="+today1.get(Calendar.YEAR));

System.out.println("month" +(today1.get(Calendar.MONTH)+1));

System.out.println("요일번호"+today1.get(Calendar.DAY_OF_WEEK));

System.out.println("minute="+ today1.get(Calendar.MINUTE));

System.out.println("월의 요일번호"+ today1.get(Calendar.DAY_OF_MONTH));

System.out.println("월의 말일"+ today1.getActualMaximum(Calendar.DAY_OF_MONTH));

}

}