1. Determine the season according to the numbers from 1 to 12
package com.bdqn.demo;
import java.util.Scanner;
public class Season {
String season;//season
int month;//month
public void show() {
switch(month) {//switch to select the corresponding data
case 1:
case 2:
case 3:
season="spring";
System.out.println("The season is "+season);
break;
case 4:
case 5:
case 6:
season="summer";
System.out.println("The season is "+season);
break;
case 7:
case 8:
case 9:
season="Autumn";
System.out.println("The season is "+season);
break;
case 10:
case 11:
case 12:
season="winter";
System.out.println("The season is "+season);
break;
}
}
public static void main(String[] args) {
Scanner input=new Scanner(System.in);
Season sea=new Season();//Create object
System.out.print("Please enter the month: ");
sea.month=input.nextInt();
sea.show();//Call the method
}
}
2. Define the four methods of adding, subtracting and dividing by analog computer
package com.bdqn.demo;
import java.util.Scanner;
public class Calculator {
double num1;
double num2;
double sum;//Calculate sum
int choose;//Choose the calculation method
public double addition() {//Add and return the calculated value
sum=num1+num2;
return sum;
}
public double subtion() {//Subtract and return the calculated value
sum=num1-num2;
return sum;
}
public double multion() {//Multiply and return the calculated value
sum=num1*num2;
return sum;
}
public double division() {//Division and return the calculated value
sum=num1/num2;
return sum;
}
public static void main(String[] args) {
Scanner input=new Scanner(System.in);
Calculator calc=new Calculator();
System.out.print("Please enter the first number: ");
calc.num1=input.nextInt();
System.out.print("Please enter the second number: ");
calc.num2=input.nextInt();
System.out.print("Please enter the calculation method (1. Addition 2. Subtraction 3. Multiplication 4. Division)");
calc.choose=input.nextInt();
switch(calc.choose) {//switch selects the calculation method
case 1:
System.out.println(calc.addition());//Call the calculation method
break;
case 2:
System.out.println(calc.subtion());
break;
case 3:
System.out.println(calc.multion());
break;
case 4:
System.out.println(calc.division());
break;
}
}
}
3. Use the parameterized method to simulate the computer
package com.bdqn.demo;
import java.util.Scanner;
public class Calculator1 {
int choose;//Value and
public int ope(int op,int num1,int num2) {//Receive parameters
if(op==1) {//Calculation method
choose=num1+num2;
} else if (op == 2) {
choose=num1-num2;
} else if (op == 3) {
choose=num1*num2;
}else {
choose=num1/num2;
}
return choose;//return and value
}
public static void main(String[] args) {
Scanner input=new Scanner(System.in);
Calculator1 calc=new Calculator1();//Create object
System.out.print("Please select operation 1. Addition 2. Subtraction 3. Multiplication 4. Division: ");
int op=input.nextInt();
System.out.print("Please enter the first number: ");
int num1=input.nextInt();
System.out.print("Please enter the second number: ");
int num2=input.nextInt();
System.out.println("The result of the operation is "+calc.ope(op, num1, num2));//Pass parameters
}
}
4. Analog TV commodity price quiz
package com.bdqn.demo;
import java.util.Scanner;
public class QuessMachine {
int money; // commodity price
String type;//Product name
public void initial() {
int choose=(int)(Math.random()*3);//The generated random number output corresponds to the product
if(choose==0) {
type="electric bicycle";
money=1500;
}else if(choose==1) {
type="bicycle";
money=500;
}else {
type="toy car";
money=99;
}
}
public static void main(String[] args) {
Scanner input=new Scanner(System.in);
QuessMachine ques=new QuessMachine();//Create object
int num=0;
ques.initial();//Call the method
System.out.print("Please guess the price of ""+(ques.type)+"": ");
int money=input.nextInt();
while(money!=ques.money) {
num++;//Add one if output once
if(num>=4) {//Exit loop when input 4 times
System.out.println("I didn't guess correctly within 4 times, try my best next time!");
break;
}
if(money>ques.money) {//Return the corresponding data corresponding to the commodity price
System.out.println("Smaller!\n");
System.out.print("Guess again: ");
money=input.nextInt();//Re-input
}else if(money<ques.money) {
System.out.println("Bigger!\n");
System.out.print("Guess again: ");
money=input.nextInt();
}
}
if(money==ques.money) {
System.out.println("\nCongratulations on your guess and got the "+ques.type+" reward!");
}
}
}
5. Insert elements into the specified array and output
package com.bdqn.demo;
import java.util.Arrays;
import java.util.Scanner;
public class TestAdd {
public void insertArray(int[]arr,int index,int value) {//Element backward method
for(int i=arr.length-1;i>index;i--) {
arr[i]=arr[i-1];
}
arr[index]=value;//Find the insert number position
}
public void showarr(int[]arr) {//Print the original array method
for(int i=0;i<arr.length;i++) {
System.out.println(arr[i]);
}
}
public static void main(String[] args) {
Scanner input=new Scanner(System.in);
TestAdd test=new TestAdd();//Create object
int[]arr1=new int[5];//Create the original array
for(int i=0;i<arr1.length;i++) {//loop to output numbers
System.out.print("Please enter "+(i+1)+" number: ");
arr1[i]=input.nextInt();
}
System.out.println("The original array is: ");
test.showarr(arr1);//Call the print array method
int[]arr=Arrays.copyOf(arr1,arr1.length+1);//Copy the original array value and add a new length
System.out.print("Please output the number to be inserted: ");
int value=input.nextInt();
System.out.print("Please enter the subscript of the number to be inserted: ");
int index=input.nextInt();
test.insertArray(arr, index, value);//Pass parameters
System.out.println("The inserted array is: ");
for(int i=0;i<arr.length;i++) {//Print new array
System.out.println(arr[i]);
}
}
}
6. The object parameter outputs java, c#, sql scores and calculates the average score
package com.bdqn.demo;
class Student {//Student class
int java;//java score
int c;//c# grades
int sql;//SQL score
double avg;//average grade
public void addScore() {//Calculate the average score method and print the score
avg = (java + c + sql + avg) /3.0;
System.out.println("JAVA score:" + java + "C# score:" + c + "SQL score:" + sql +"\nAverage score: "+avg);
}
public static class StudentBiz {//Student management class
Student student[] = new Student[30];//Create an array of grade objects
public void addName(Student stu) {//Add score array method
for (int i = 0; i < student.length; i++) {
if (student[i] == null) {
student[i] = stu;
break;
}
}
}
public void showName() {//Print result array method
System.out.println("List of grades:");
for (int i = 0; i < student.length; i++) {
if (student[i] != null) {
student[i].addScore();
}
}
System.out.println();
}
public static void main(String[] args) {
Student student1 = new Student();//Create a student object
student1.java = 90;//Attribute assignment
student1.c = 85;
student1.sql=88;
Student student2=new Student();
student2.java=75;
student2.c=80;
student2.sql=90;
StudentBiz student=new StudentBiz();//Create student management object
student.addName(student1);//Incoming the method and parameters of adding student grades
student.addName(student2);
student.showName();//Import array score printing method
}
}
}