JAVA学习--模板方法设计模式

public class TestTemplate {
    public static void main(String[] args) {
        new SubTemplate().spendTime();
    }
}

abstract class Template {

    public abstract void code();

    public void spendTime() {
        long start = System.currentTimeMillis();

        this.code();

        long end = System.currentTimeMillis();
        System.out.println("花费的时间为：" + (end - start));
    }
}

class SubTemplate extends Template {
    
    public void code() {
        boolean flag = false;
        for(int i = 2;i <= 10000;i++){
            for(int j = 2;j <= Math.sqrt(i);j++){
                if(i % j == 0){
                    flag = true;
                    break;
                }
            }
            if(!flag){
                System.out.println(i);
            }
            flag = false;
        }
    }
}