static关键字的使用(一)

static方法与构造

静态方法一般不能调用任何非静态成员，却能调用非静态的构造

package staticmethod;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		StaticMethod aMethod=StaticMethod.newInstance();
		System.out.println(aMethod);
	}

}
class StaticMethod{
	private int id;
	private String name;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public static StaticMethod newInstance(){
		
		return new StaticMethod(1, "hhh");
	}
	private StaticMethod(){
		
	}
	@Override
	public String toString() {
		return "StaticMethod [id=" + id + ", name=" + name + "]";
	}
	private StaticMethod(int id, String name) {
		super();
		this.id = id;
		this.name = name;
	}
}

static方法与接口

接口中可以包含static方法了，但是必须有方法的实现，且调用方式有严格限制

public interface TestInter {
void printme();
static void print_s(){
System.out.println("print in static method in interface");
}
}

必须像下面这样调用

TestInter.print_s();