ArrayList的问题,如何添加以后再输出

Question

import java.util.ArrayList;
import java.util.Scanner;

public class Test {
public static void main(String[] args) {
ArrayList al = new ArrayList();
for(int i = 0;i<=10;i++){
Scanner input = new Scanner(System.in);
System.out.println("请输入猫的颜色:");
String col = input.next();
Cat c = new Cat();
c.setColor(col);
al.add();
System.out.println("请输入猫的体重:");
double wei = input.nextDouble();
c.setWeight(wei);
System.out.println("请输入猫的身高:");
double hei = input.nextDouble();
c.setWeight(hei);
System.out.println("是否继续 y/n");
char choose = input.next().charAt(0);
if(choose=='y'){
continue;
}else{
break;
}
}
System.out.println("打印信息:");
Cat c = new Cat();
for(int j =0;j<=10;j++){
System.out.println(c.getinfo());
}
}
}
我一共写了2各类，现在就是要在测试类中输入各项数据，利用ArrayList添加，然后再循环输出，这里改怎么做吗，求指导

Answer 1

ArrayList添加以后输出，可以使用get（position）来遍历每个集合的数据，实例如下：

import java.util.ArrayList;
import java.util.Scanner;

public class Test {
public static void main(String[] args) {
ArrayList<Cat> al = new ArrayList<Cat>();
for(int i = 0;i<=10;i++){
Scanner input = new Scanner(System.in);
System.out.println("请输入猫的颜色:");
String col = input.next();
Cat c = new Cat();
c.setColor(col);
al.add(c);
System.out.println("请输入猫的体重:");
double wei = input.nextDouble();
c.setWeight(wei);
System.out.println("请输入猫的身高:");
double hei = input.nextDouble();
c.setWeight(hei);
System.out.println("是否继续 y/n");
char choose = input.next().charAt(0);
if(choose=='y'){
continue;
}else{
break;
}
}
System.out.println("打印信息:");
for(Cat c:al ){
    System.out.println(c.getinfo());//输出ArrayList的数据
}
}

Answer 2

import java.util.ArrayList;
import java.util.Scanner;

public class Test {
public static void main(String[] args) {
ArrayList al = new ArrayList();
for(int i = 0;i<=10;i++){
Scanner input = new Scanner(System.in);
System.out.println("请输入猫的颜色:");
String col = input.next();
Cat c = new Cat();
c.setColor(col);
al.add(c);
System.out.println("请输入猫的体重:");
double wei = input.nextDouble();
c.setWeight(wei);
System.out.println("请输入猫的身高:");
double hei = input.nextDouble();
c.setWeight(hei);
System.out.println("是否继续 y/n");
char choose = input.next().charAt(0);
if(choose=='y'){
continue;
}else{
break;
}
}
System.out.println("打印信息:");
for(Cat c:al ){
System.out.println(c.getinfo());
}
}追问

下面遍历输出的那个al报错了，显示Type mismatch: cannot convert from element type Object to Cat,这是什么原因吗

追答

哦 不好意思，刚才忘记修改前面了
import java.util.ArrayList;
import java.util.Scanner;

public class Test {
public static void main(String[] args) {
ArrayList al = new ArrayList();
for(int i = 0;i<=10;i++){
Scanner input = new Scanner(System.in);
System.out.println("请输入猫的颜色:");
String col = input.next();
Cat c = new Cat();
c.setColor(col);
al.add(c);
System.out.println("请输入猫的体重:");
double wei = input.nextDouble();
c.setWeight(wei);
System.out.println("请输入猫的身高:");
double hei = input.nextDouble();
c.setWeight(hei);
System.out.println("是否继续 y/n");
char choose = input.next().charAt(0);
if(choose=='y'){
continue;
}else{
break;
}
}
System.out.println("打印信息:");
for(Cat c:al ){
System.out.println(c.getinfo());
}
}

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