第五次java作业

1.

[java] view plain copy

1. public class E{  
2.  public static void main(String args[]){  
3.  String s1,s2,t1="ABCDabcd";  
4.  s1=t1.toUpperCase();  
5.  s2=t1.toLowerCase();  
6.  System.out.println(s1);  
7.  System.out.println(s2);  
8.  String s3=s1.concat(s2);  
9.  System.out.println(s3);  
10.  }  

2.

[java] view plain copy

1. public class E{  
2.  public static void main(String args[]){  
3.  String s="ABCDabcd";  
4. char cStart=s.charAt(0);  
5. char cEnd=s.charAt(s.length()-1);  
6. System.out.println(cStart);  
7. System.out.println(cEnd);  
8.  }  
9. }  
10. 
    

3.

[java] view plain copy

1. import java.util.*;  
2. public class E{  
3.  public static void main(String args[]){  
4. int year1,month1,day1,year2,month2,day2;  
5. try{year1=Integer.parseInt(args[0]);  
6. month1=Integer.parseInt(args[1]);  
7. day1=Integer.parseInt(args[2]);  
8. year2=Integer.parseInt(args[3]);  
9. month2=Integer.parseInt(args[4]);  
10. day2=Integer.parseInt(args[5]);  
11. }  
12. catch(NumberFormatException e)  
13. {year1=2012;  
14. month1=0;  
15. day1=1;  
16. year2=2018;  
17. month2=0;  
18. day2=1;  
19. }  
20. Calendar calendar=Calendar.getInstance();  
21. calendar.set(year1,month1-1,day1);  
22. long timeYear1=calendar.getTimeInMillis();  
23. calendar.set(year2,month2-1,day2);  
24. long timeYear2=calendar.getTimeInMillis();  
25. long 相隔天数=Math.abs((timeYear1=timeYear2)/(1000*60*60*24));  
26. System.out.println(""+year1+"年"+month1+"月"+day1+"日和"+  
27. year2+"年"+month2+"月"+day2+"日相隔"+"相隔天数"+"天");  
28.  }  
29. }  

4.

[java] view plain copy

1. import java.util.*;  
2. public class E{  
3.  public static void main(String args[]){  
4. double a=0,b=0,c=0;  
5. a=12;  
6. b=24;  
7. c=Math.asin(0.56);  
8. System.out.println(c);  
9. c=Math.cos(3.14);  
10. System.out.println(c);  
11. c=Math.exp(1);  
12. System.out.println(c);  
13. c=Math.log(8);  
14. System.out.println(c);  
15.  }  
16. }  

5.

[java] view plain copy

1. public class E{  
2.  public static void main(String args[]){  
3. String str="ab123you你是谁?";  
4. String regex="\\D+";  
5. str=str.replaceAll(regex,"");  
6. System.out.println(str);  
7.  }  
8. }  

6.

[java] view plain copy

1. import java.util.*;  
2. public class E{  
3.     public static void main(String args[]){  
4.         String cost="数学87分,物理76分,英语96分";  
5.         Scanner scanner=new Scanner(cost);  
6.         scanner.useDelimiter("[^0123456789.]+");  
7.         double sum=0;  
8.         int count=0;  
9.         while(scanner.hasNext()){  
10.             try{  double score=scanner.nextDouble();  
11.             count++;  
12.             sum=sum+score;  
13.             System.out.println(score);  
14.             }  
15.             catch(InputMismatchException exp){  
16.                 String t=scanner.next();  
17.             }  
18.         }  
19.         System.out.println("总分:"+sum+"分");  
20.         System.out.println("平均分:"+sum/count+"分");  
21.     }  
22. }