Java(第三天)

一、获取当前时间

package exercise;
import javax.swing.JOptionPane;
public class ShowCurrentTime {
       public static void main(String[] args) {
              long totalMilliseconds=System.currentTimeMillis();  //获取当前时间的方法
              long totalSeconds=totalMilliseconds/1000;
              int currentSecond=(int)(totalSeconds%60);   //将long整数型转换为int整数型
              long totalMinutes=totalSeconds/60;
              int currentMinutes=(int)(totalMinutes%60);
              long totalHours=totalMinutes/60;
              int currentHours=(int)(totalHours%24);
              JOptionPane.showMessageDialog(null,"现在的时间是"+currentHours+"点"+currentMinutes+"分"+currentSecond+"秒");
       }
}

二、从控制台获取输入

package exercise;
import java.util.Scanner;
public class ScannerInput {
       public static void main(String[] args) {
              Scanner scanner=new Scanner(System.in);    //获取方法     
              System.out.println("请随便输入一个整数");
              int i=scanner.nextInt();
              System.out.println("请随便输入一个小数");
              double d=scanner.nextDouble();
              System.out.println("请随便输入字符串(中间不能有空格)");
              String s=scanner.next();    //字符串不需要next
              System.out.println("您输入的整数为 "+i+"\n"+"您输入的小数为 "+d+"\n"+"您输入的字符串为 "+s);
       }
}