Training three

1、。

import java.util.*;
public class num3 { public static void main(String[] args){ int a[]; a = new int[5]; for(int i=0;i<5;i++){ a[i]=(int)(Math.random()*55+1); System.out.println(a[i]); } } }

2。 

import java.text.SimpleDateFormat;
import java.util.*;
public class fate { public static void main(String[] args) { Date date = new Date(); System.out.println("时间:"+date); String strDate = date.toString(); String year = strDate.substring(24,28); String month = strDate.substring(4,7); String day = strDate.substring(9,10); String hour = strDate.substring(11,13); String min = strDate.substring(14,16); String sec = strDate.substring(17,19); System.out.print(year+"年"); System.out.print(month+"月"); System.out.print(day+"日 "); System.out.print(hour+"时"); System.out.print(min+"分"); System.out.println(sec+"秒"); //2,获取当前系统时间,运用subString()方法,显示年份。 SimpleDateFormat dateformat1=new SimpleDateFormat("yyyy年"); String a1 = dateformat1.format(new Date()); System.out.println("时间:"+a1); //3,使用Calendar类显示当前日期。 Calendar a2 = Calendar.getInstance(); System.out.print(a2.get(Calendar.YEAR)+"年"); System.out.print((a2.get(Calendar.MARCH)+1)+"月"); System.out.print(a2.get(Calendar.DATE)+"日"); System.out.print(a2.get(Calendar.HOUR)+":"); System.out.print(a2.get(Calendar.MINUTE)+":"); System.out.print(a2.get(Calendar.SECOND)); } }

3。

import java.util.*;
public class fate { 
    public static void main(String[] args) { ArrayList a1 = new ArrayList(); a1.add("月"); a1.add("火"); a1.add("水"); a1.add("木"); a1.add("金"); a1.add("土"); a1.add("日"); int i; Scanner c = new Scanner(System.in); System.out.println("输入星期数"); i = c.nextInt(); System.out.println(a1.get(i-1)+"曜日"); } }

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Origin www.cnblogs.com/abcd609553/p/10986579.html