面向对象进阶static-静态变量

package Static.a01StaticDemo;

public class Student {
    private String name;
    private int age;
    private char gender;
    public static String TeacherName;

    public Student() {
    }

    public Student(String name, int age, char gender) {
        this.name = name;
        this.age = age;
        this.gender = gender;
    }
   /**
     * 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 gender
     */
    public char getGender() {
        return gender;
    }

    /**
     * 设置
     * @param gender
     */
    public void setGender(char gender) {
        this.gender = gender;
    }

    public String toString() {
        return "Student{name = " + name + ", age = " + age + ", gender = " + gender + "}";
    }
    //行为
    public void study(){
        System.out.println(name+"正在学习");
    }
    public void show(){
        System.out.println(name+", "+age+", "+gender+","+TeacherName);
    }
}

package Static.a01StaticDemo;

public class Student {
    private String name;
    private int age;
    private char gender;
    public static String TeacherName;

    public Student() {
    }

    public Student(String name, int age, char gender) {
        this.name = name;
        this.age = age;
        this.gender = gender;
    }
   /**
     * 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 gender
     */
    public char getGender() {
        return gender;
    }

    /**
     * 设置
     * @param gender
     */
    public void setGender(char gender) {
        this.gender = gender;
    }

    public String toString() {
        return "Student{name = " + name + ", age = " + age + ", gender = " + gender + "}";
    }
    //行为
    public void study(){
        System.out.println(name+"正在学习");
    }
    public void show(){
        System.out.println(name+", "+age+", "+gender+","+TeacherName);
    }
}

、

package Static.a02StaticDemo;

public class ArrayUtil {
    //私有化构造方法
    private ArrayUtil(){

    }
    //遍历数组
    public static String printArr(int[]arr){
        StringBuilder sb=new StringBuilder();
        sb.append("[");
        for (int i = 0; i < arr.length; i++) {
            if (i== arr.length-1){
                sb.append(arr[i]);
            }else {
                sb.append(arr[i]).append(", ");
            }
        }
        sb.append("]");

        return sb.toString();
    }
    //求平均值
    public static double getAverage(double[]arr){
        double sum=0;
        for (int i = 0; i < arr.length; i++) {
            sum=sum+arr[i];
        }
        return sum/arr.length;
    }
}

package Static.a02StaticDemo;

public class Test {
    public static void main(String[] args) {
        //测试工具类中的两个方法是否正确
        int[]arr={1,2,3,4,5,6};
        String s = ArrayUtil.printArr(arr);
        System.out.println(s);

        double[]arr1={1.1,2.2,3.3,4.4,5.5};
        double average = ArrayUtil.getAverage(arr1);
        System.out.println(average);
    }
}

package Static.a03StaticDemo;

public class ArrayUtil {
    private String name;
    private int age;
    private char gender;

    public ArrayUtil() {
    }

    public ArrayUtil(String name, int age, char gender) {
        this.name = name;
        this.age = age;
        this.gender = gender;
    }

    /**
     * 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 gender
     */
    public char getGender() {
        return gender;
    }

    /**
     * 设置
     * @param gender
     */
    public void setGender(char gender) {
        this.gender = gender;
    }

    public String toString() {
        return "ArrayUtil{name = " + name + ", age = " + age + ", gender = " + gender + "}";
    }

}

package Static.a03StaticDemo;

import java.util.ArrayList;

public class ArrayUtil1 {
    private ArrayUtil1(){

    }
    public static int getMaxAge(ArrayList<ArrayUtil> list){
        int max = list.get(0).getAge();
        for (int i = 1; i < list.size(); i++) {
            int tempAge = list.get(i).getAge();
            if (tempAge>max){
                max=tempAge;
            }
        }
        return max;
    }
}

package Static.a03StaticDemo;

import StudentManagementSystem.Student;

import java.util.ArrayDeque;
import java.util.ArrayList;

public class Test {
    public static void main(String[] args) {
        //创建一个集合用来存储数据对象
        ArrayList<ArrayUtil>list=new ArrayList<>();
        ArrayUtil au1=new ArrayUtil("zhangs",18,'男');
        ArrayUtil au2=new ArrayUtil("lishi",28,'男');
        ArrayUtil au3=new ArrayUtil("wangwu",38,'男');
        list.add(au1);
        list.add(au2);
        list.add(au3);
        int age = ArrayUtil1.getMaxAge(list);
        System.out.println(age);
    }
}