一、代码
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
public class Main1 {
public static void main(String[] args) {
Date nowDate = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("aa", Locale.ENGLISH);
String format = sdf.format(nowDate);
System.out.println(format);
if(format.contains("PM")){
System.out.println("下午");
}else if(format.contains("AM")){
System.out.println("上午");
}
SimpleDateFormat sdf2 = new SimpleDateFormat("MMM dd,yyyy HH:mm:ss aa", Locale.ENGLISH);
String format2 = sdf2.format(nowDate);
System.out.println("24小时制:"+format2);
SimpleDateFormat sdf3 = new SimpleDateFormat("MMM dd,yyyy h:mm:ss aa", Locale.ENGLISH);
String format3 = sdf3.format(nowDate);
System.out.println("12小时制:"+format3);
}
}
二、输出

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