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Generic.java
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Generic.java
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package com.example.review.polymorphic.generic;
import java.util.List;
import java.util.Random;
import static com.example.util.Utils.printArr;
/**
* ClassName: Generic.java
* Author: chenyiAlone
* Create Time: 2019/7/27 10:21
* Description: 测试泛型的使用
*/
public class Generic {
interface Generate<T> {
T generate();
}
static class IntegerGenerate implements Generate<Integer> {
private Random random;
private IntegerGenerate() {
this.random = new Random();
}
@Override
public Integer generate() {
return new Random().nextInt(100);
}
}
private static <T> T[] generateArr() {
return (T[])new Object[10];
}
private static <T> T[] array(T[] arr, Generate<T> gen) {
for (int i = 0; i < arr.length; i++) {
arr[i] = gen.generate();
}
return arr;
}
private static <T> void method() {
List<? extends GenericBound> list = null;
// list.add(new GenericBound());
}
public static void main(String[] args) {
Integer[] arr = new Integer[10];
arr = array(arr, new IntegerGenerate());
printArr(arr);
int[] intArr = {1, 2, 3};
// printArr((Integer[])intArr);
Integer[] arr1 = Generic.<Integer>generateArr();
arr1[1] = 2;
}
}