public class Array < T > {
private T[] arr;
public Array(){
arr = (T[]) new Object[10];
}}
can be executed in this way, but an error occurs when T extends Comparable < T >
how should it be defined
public class Array < T > {
private T[] arr;
public Array(){
arr = (T[]) new Object[10];
}}
can be executed in this way, but an error occurs when T extends Comparable < T >
how should it be defined
= update
I don't know if you want to emulate an ArrayList,. I wrote a very crude one, in which the Object [] array is used to store it, and then converted to T when taken out.
public class Array<T extends Comparable<T>> {
private Object[] arr;
public static void main(String[] args) {
Array<A> arr = new Array<A>();
arr.set(0, new A(24));
arr.set(1, new A(25));
System.out.println(arr.get(1));
}
public Array(){
arr = new Object[10];
}
public void set(int index, T ele) {
arr[index] = ele;
}
public T get(int index) {
return (T) arr[index];
}
}
class A implements Comparable<A>{
private int age;
public A(int age) {this.age = age;}
public A() {}
public int getAge() {
return this.age;
}
public void setAge(int age) {
this.age = age;
}
public int compareTo(A a) {
return this.age - a.getAge();
}
} in the source code of ArrayList , it also uses the Object array to store elements:
transient Object [] elementData;
= original answer
Comparable is an interface and should be used implements ;
in addition, is your Array a class or? What mistake did you report?
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