1 class FormalCollection<E>{
 2 
 3 Object[] objects;
 4 
 5 
 6 FormalCollection(){
 7     objects=new Object[5];
 8 }
 9 
10 public E getObjects(int index) {
11     return (E)objects[index];
12 }
13 
14 public void setObjects(E object,int index) {
15     objects[index] = object;
16 }
17 }

 1 FormalCollection<String> formalCollectionString = new FormalCollection<>();
 2 
 3     formalCollectionString.setObjects("zhangsan",0);
 4     formalCollectionString.setObjects("lisi",1);
 5     formalCollectionString.setObjects("wanger",2);
 6     formalCollectionString.setObjects("longwu",3);
 7 
 8     FormalCollection<Integer> formalCollectionInteger = new FormalCollection<>();
 9 
10     formalCollectionInteger.setObjects(25,0);
11     formalCollectionInteger.setObjects(26,1);
12     formalCollectionInteger.setObjects(27,2);
13     formalCollectionInteger.setObjects(28,3);
14 
15 
16     FormalCollection<Double> formalCollectionDouble = new FormalCollection<>();
17 
18     formalCollectionDouble.setObjects(12500.00,0);
19     formalCollectionDouble.setObjects(12600.00,1);
20     formalCollectionDouble.setObjects(12700.00,2);
21     formalCollectionDouble.setObjects(42800.00,3);
22 
23 
24     System.out.println("姓名"+"\t\t\t"+"年龄"+"\t\t\t"+"薪资");
25 
26     System.out.println(formalCollectionString.getObjects(0)+"\t"+formalCollectionInteger.getObjects(0)+"\t\t\t"+formalCollectionDouble.getObjects(0));
27     System.out.println(formalCollectionString.getObjects(1)+"\t\t"+formalCollectionInteger.getObjects(1)+"\t\t\t"+formalCollectionDouble.getObjects(1));
28     System.out.println(formalCollectionString.getObjects(2)+"\t\t"+formalCollectionInteger.getObjects(2)+"\t\t\t"+formalCollectionDouble.getObjects(2));