Object [] obj;

Object [ ] obj = new Object [ num ]; 

这个数组里面装的都是对象 ，int 装进去自动装箱为Integer ，可以直接用equals() 。

public class Work193_2 {

private Object[] list;
private int next;
public Work193_2(int num) {
list = new Object[num];
}
public Work193_2() {
this(16);
}
public void add(Object o) { // Object o = new Object() ;
if (next == list.length) {
list = Arrays.copyOf(list, list.length * 2);
}
list[next++] = o + "";
}

public Object get(int index) {
return list[index];
}

public int size() {
return next;
}

public String toString() {
// String str4 =(String) this.get(0)+" ";
String str5 = "";
for (int x = 0; x < this.size(); x++) {
str5 = str5 + this.get(x) + " ";
}
return str5;
}
public boolean equals(Object obj) {
Work193_2 work2 = (Work193_2) obj;

if (this.size() != work2.size()) {

return false;
}

for (int x = 0; x <this.size(); x++) {

if(!this.list[x].equals(work2.list[x]))      //Object 数组里面装的都是对象

return false;
} 

return true;
}
public static void main(String[] args) {
Work193_2 work = new Work193_2(); // 创建了一个长度为16的Object数组
work.add("z");
// System.out.println(work.get(0));
work.add(7);
work.add(99);
System.out.println(work);
Work193_2 work2 = new Work193_2();
work2.add("z");
work2.add(7);
work2.add(99);
System.out.println(work2);
boolean boo = work.equals(work2);
System.out.println(boo);
}
}