public void add(int... nums){int sum = 0;for(int i=0; i<nums.length; i++){sum += nums[i];}System.out.println(sum);
}

public void add(int[] nums){int sum = 0;for(int num : nums){sum += num;}System.out.println(sum);
}

package xyz.pascall.study;
import static java.util.Calendar.*;public class StaticImport {public static void main(String[] args) {System.out.println(DAY_OF_MONTH);}
}

package xyz.pascall.study;import java.util.List;
import java.util.Map;public class StaticImport {public static void main(String[] args) {String name = new GenericityDemoOne<String>("小明").getT();System.out.println(name);}
}/*** 简单泛型使用* @author zhang** @param <T>*/
class GenericityDemoOne<T>{private T t;public GenericityDemoOne(T t) {this.t = t;}public T getT() {return t;}
}/*** 泛型在方法上使用* @author zhang**/
abstract class GenericityDemoTwo{/*** 泛型在方法上声明* @param t*/public static <T extends Object> void show(T t) {System.out.println(t);}/*** 通配符使用，泛型在方法参数上声明* @param list*/public static void show(List<? extends Object> list) {System.out.println(list);}/*** 泛型在抽象方法上使用* @param map*/public abstract <S, I> void show(Map<S, I> map);
}

package xyz.pascall.study;public class Enumeration {public static void main(String[] args) {Color red = Color.RED;System.out.println(red.getName());}
}/*** 枚举* @author zhang**/
enum Color{/*** 定义实例化Color类*/RED("红色"), GREEN("绿色");// 定义枚举属性private String name;private Color(String name) {this.name = name;}public String getName() {return name;}
}

package xyz.pascall.study;/** Annotation中三种基本注解使用*/
public class AnnotationDemo{/*** Override:用于准确覆写父类的方法，否则编译时出错*/@Overridepublic String toString() {// TODO Auto-generated method stubreturn super.toString();}/*** Deprecated:用于声明方法过期*/@Deprecatedpublic void sayHello() {System.out.println("Hello");}/*** SuppressWarnings:用于压制多个警告*/@SuppressWarnings("unused")private String title;
}