java进阶static -修饰成员方法 - 工具类26

 

 

 

 

package StaticM;

public class static01 {
    String name;
    int age;
    static String school;//

    public static01() {
    }

    public static01(String name, int age, String school) {
        this.name = name;
        this.age = age;
        this.school = school;
    }

    /**
     * 获取
     * @return name
     */
    public String getName() {
        return name;
    }

    /**
     * 设置
     * @param name
     */
    public void setName(String name) {
        this.name = name;
    }

    /**
     * 获取
     * @return age
     */
    public int getAge() {
        return age;
    }

    /**
     * 设置
     * @param age
     */
    public void setAge(int age) {
        this.age = age;
    }

    /**
     * 获取
     * @return school
     */
    public String getSchool() {
        return school;
    }

    /**
     * 设置
     * @param school
     */
    public void setSchool(String school) {
        this.school = school;
    }

    public String toString() {
        return "static01{name = " + name + ", age = " + age + ", school = " + school + "}";
    }
}

package StaticM;

public class StaticDemo {
    public static void main(String[] args) {
        static01 stu = new static01();
        stu.name = "张三";
        stu.age = 23;
        static01.school = "清华";//建议用类名调用
        System.out.println(stu.name+stu.age+static01.school);
        static01 stu2 = new static01();
        stu2.name = "张三";
        stu2.age = 23;
        System.out.println(stu2.name+stu2.age+stu2.school);
    }
}

　　工具类：

package com.tools;

public class toolsArr {
    private toolsArr() {
    }

    ;

    public static int max(int arr[]) {
        int max = arr[0];
        for (int i = 0; i < arr.length; i++) {
            if (arr[i] > max) {
                max = arr[i];
            }
        }
        return max;
    }

    public static int min(int arr[]) {
        int min = arr[0];
        for (int i = 0; i < arr.length; i++) {
            if (arr[i] < min) {
                min = arr[i];
            }
        }
        return min;
    }

    public static void sharedArray(int arr[]) {
        System.out.print("[");
        for (int i = 0; i < arr.length - 1; i++) {
            System.out.print(arr[i] + ", ");
        }
        System.out.print(arr[arr.length - 1] + "]");
    }
}

package com.tools;

public class tools {
    //    1.成员方法什么时候加入
//          static常用于制作工具类
//    2.工具类:不是描述事物的,而是帮我们完成一些事情(打工)
//    3.如果发现一个类中,所有的方法,全都是 static所修饰私有该类的构造方法
//          目的:为了不让其他类,再创建对象
    public static void main(String[] args) {
        int arr[] = {123, 456, 789};
        System.out.println(toolsArr.max(arr));
        System.out.println(toolsArr.min(arr));
        toolsArr.sharedArray(arr);
    }
}