实验 1
生成一个日历类，输入日期后能正确输出对应的星期。例如，输入 2019,12,10 应能正确输出 星期二 。
public class CalculateWeekDay{
public static void CalculateWeekDay(int y, int m, int d) {
if(m < 1 || m >12){
System.out.println("你输入的月份不再范围内，请重新输入！");
}
if (m == 1 || m == 2) {
m += 12;
y--;
}
int iWeek = (d + 2 * m + 3 * (m + 1) / 5 + y + y / 4 - y / 100 + y / 400) % 7;
switch (iWeek) {
case 0:
System.out.println("星期一\n");
break;
case 1:
System.out.println("星期二\n");
break;
case 2:
System.out.println("星期三\n");
break;
case 3:
System.out.println("星期四\n");
break;
case 4:
System.out.println("星期五\n");
break;
case 5:
System.out.println("星期六\n");
break;
case 6:
System.out.println("星期日\n");
break;
}
}
public static void main(String args[]) {
CalculateWeekDay(2019, 12, 11);
}
}
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实验 2
使用递归计算出 12345*…..*30 的值并输出，使用递归计算 1+2+3+4+5+…..+1000 的值并输出。
public class DiGui {
public static int jicheng(int n) {
if(n==1||n==0)
return n;
else
return n*jicheng(n-1);
}
public static int count(int n) {
if(n==1||n==0)
return n;
else
return n+count(n-1);
}
public static void main(String[] args) {
System.out.println("1*2*3*4*5*.....*30="+count(30));
System.out.println("1+2+3+4+5+.....+1000="+count(1000));
}
}
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实验 3
给定数组 1,5,3,7,11,6,13,9,8，找出该数组的最大值，求出该数组的平均值，对该数组求和并求出数组长度。
public class FindMax {
public static void main(String[] args) {
int[] arr= {1,5,3,7,11,6,13,9,8};
int max=arr[0];
int sum=0;
float avg=0;
for(int i=1;i<arr.length;i++) {
if(arr[i]>max)
max=arr[i];
sum+=arr[i];
}
avg=sum/arr.length;
System.out.println("max="+max);
System.out.println("sum="+sum);
System.out.println("avg="+avg);
System.out.println("arr.length="+arr.length);
}
}
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实验 4
第 3 章课后习题 103 页第五大题编程题 1
class Student{
private String name;
private double grade;
public Student() {
}
public Student(String name,double grade) {
this.name=name;
this.grade=grade;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name=name;
}
public double getGrade() {
return grade;
}
public void setGrade(double grade) {
this.grade=grade;
}
}
public class Test {
public static void main(String[]args) {
Student stu1=new Student();
stu1.setName("zhangsan");
stu1.setGrade(99);
Student stu2=new Student();
stu2.setName("Li");
stu2.setGrade(100);
}
}
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实验 5
第 4 章课后习题 153 页第五大题编程题 1
public class Student {
public String name;
public int age;
public Student(String name,int age)
{
this.name=name;
this.age=age;
}
public void show(){
System.out.println("name: "+name+" age: "+age);
}
}
public class UnderGraduate extends Student{
public String degree;
public UnderGraduate(String name,int age,String degree){
super(name, age);
this.degree=degree;}
public void show(){
System.out.println("name: "+name+" age: "+age+" degree: "+degree);
}
}
public class Test01{
public static void main(String[] args) {
Student student = new Student("丽丽", 16);
student.show();
UnderGraduate underGraduate = new UnderGraduate("爱敬", 30, "bechalor");
underGraduate.show();
}
}
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第 4 章课后习题 153 页第五大题编程题 2
public abstract class Shape {
public abstract double area();
public abstract String getType();
public Shape(){};
}
public class Circle extends Shape{
private double radius;
public Circle(double radius) {
this.radius=radius;
}
public double area() {
return radius*radius*3.14;
}
public String getType() {
return "circle";
}
public void show()
{
System.out.println("Type: "+getType()+" radius: "+radius+" area: "+area());
}
}
public class Square extends Shape{
private double length;
public Square(double length) {
this.length=length;
}
public double area() {
return length*length;
}
public String getType() {
return "square";
}
public void show()
{
System.out.println("Type: "+getType()+" length: "+length+" area: "+area());
}
}
public class test2 {
public static void main(String[] args) {
Square s1 = new Square(2);
s1.show();
Circle c1 = new Circle(3);
c1.show();
}
}
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实验 6
第 10 章课后习题 387 页第五大题编程题 1
public class Test01 {
public static void main(String[] args) {
Teacher t = new Teacher();
new Thread(t, "陈老师").start();
new Thread(t, "高老师").start();
new Thread(t, "李老师").start();
}
}
class Teacher implements Runnable {
private int notes = 80;
public void run() {
while (true) {
dispatchNotes();
if (notes <= 0) {
break;
}
}
}
private synchronized void dispatchNotes() {
if (notes > 0) {
try {
Thread.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName() + "---发出的笔记"
+ notes--);
}
}
}
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