public class Foo1 {
private String name;
public Foo1(String name) {
this.name = name;
}
public void showName() {
System.out.println("foo1 name: " + name);
}
// 重新定義toString() 
public String toString() {
return "foo1 name: " + name;
}
}
public class Foo2 {
private String name;
public Foo2(String name) {
this.name = name;
}
public void showName() {
System.out.println("foo2 name: " + name);
}
// 重新定義toString() 
public String toString() {
return "foo2 name: " + name;
}
}
public class SimpleCollection {
private Object[] objArr;
private int index = 0;
public SimpleCollection() {
objArr = new Object[10]; // 預設10個物件空間 
}
public SimpleCollection(int capacity) {
objArr = new Object[capacity];
}
public void add(Object o) {
objArr[index] = o;
index++;
}
public int getLength() {
return index;
}
public Object get(int i) {
return objArr[i];
}
}
public class Test {
public static void main(String[] args) {
SimpleCollection objs = new SimpleCollection();
objs.add(new Foo1("f1 number 1"));
objs.add(new Foo2("f2 number 1"));
Foo1 f1 = (Foo1) objs.get(0);
f1.showName();
Foo2 f2 = (Foo2) objs.get(1);
f2.showName();
System.out.println();
System.out.println("f1.toString(): " +
f1.toString());
System.out.println("f2.toString(): " +
f2.toString());
}
}