首先这是类
package MangerSystem;
public class Students {
private String code;
private String name;
private String age;
private String address;
public Students(){}
public Students(String code,String name,String age,String address){
this.code = code;
this.name = name;
this.age = age;
this.address = address;
}
public void setCode(String code){
this.code =code;
} public void setName(String name){
this.name =name;
} public void setAge(String age){
this.age =age;
} public void setAddress(String address){
this.address =address;
}
public String getCode(){
return code;
}public String getName(){
return name;
}public String getAge(){
return age;
}public String getAddress(){
return address;
}
}
然后是主入口,我每次用完添加方法时好像没有添加到主入口那里,然后导致调用查看方法时没有数据?
package MangerSystem;
import java.util.ArrayList;
import java.util.Scanner;
public class Manger {
public static void main(String[] args) {
while (true){
Scanner sc = new Scanner(System.in);
ArrayList<Students> array = new ArrayList<Students>();
System.out.println("------学生管理系统------");
System.out.println("请输入数字选择你要的选项");
System.out.println("1.add studens");
System.out.println("2.remove studens");
System.out.println("3.check all studens");
System.out.println("4.replace studens");
System.out.println("5.stop");
String a = sc.nextLine();
switch(a){
case "1":
System.out.println("add studen");
add(array);
break;
case "2":
System.out.println("remove studen");
break;
case "3":
System.out.println("check all studen");
checkAll(array);
break;
case "4":
System.out.println("replace studen");
break;
case "5":
System.out.println("thanks for your useing");
//return;
System.exit(0);
}
}
}
public static void add(ArrayList<Students> array){
Scanner sc = new Scanner(System.in);
System.out.println("please enter the code");
String code = sc.nextLine();
System.out.println("please enter the name");
String name = sc.nextLine();
System.out.println("please enter the age");
String age = sc.nextLine();
System.out.println("please enter the address");
String address = sc.nextLine();
Students s = new Students();
s.setCode(code);
s.setName(name);
s.setAge(age);
s.setAddress(address);
array.add(s);
System.out.println("added successfully");
}
public static void checkAll(ArrayList<Students> array){
System.out.println("学号 名字 年龄 地址");
for (int a = 0;a<array.size();a++){
Students s = array.get(a);
System.out.println(s.getCode()+" "+s.getName()+" "+s.getAge()+"old "+s.getAddress());
}
}
}
想了很久,还是没能解决。
感谢。