本博文源于课上的题目，已经进行到第五周了，java代码我写的非常累，四道题目只完成了三题，因此将这三题放出来，一道题目一道代码，内容非常死板，只需要按部就班就行了
1.第一道题
1.1 题目再现
1.2 代码
package com.company;
public class Fan {
int SLOW = 1;
int MEDIUM = 2;
int FAST = 3;
private int speed = SLOW;
private boolean on = false;
private double radius = 5;
String color = "blue";
/*public Fan(){
speed = SLOW;
on = false;
radius = 5;
color = "blue";
}*/
public Fan(){
this.speed = SLOW;
this.on = false;
this.radius = 5;
this.color = "blue";
}
public Fan(int speed,boolean on ,double radius,String color){
this.speed = speed;
this.on = on;
this.radius= radius;
this.color = color;
}
public String toString(){
if(on){
return "fan speed" + this.speed + "fan color:" + this.color + "fan radius" + this.radius;
}else{
return "fan was colsed,fan's color:" + this.color + "fan radius" + this.radius;
}
}
public void setColor(String color) {
this.color = color;
}
public void setOn(boolean on) {
this.on = on;
}
public void setRadius(double radius) {
this.radius = radius;
}
public void setSpeed(int speed) {
this.speed = speed;
}
public int getSpeed() {
return speed;
}
public String getColor() {
return color;
}
public double getRadius() {
return radius;
}
public boolean isOn() {
return on;
}
}
public class Main {
public static void main(String[] args) {
Fan f1 = new Fan();
Fan f2 = new Fan(2,true,10,"yellow");
System.out.println(f2.toString());
}
}
2、第二道题
2.1 原题再现
2.2 代码
package com.company;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
System.out.println("please input two parmeter space divide:");
Scanner sc = new Scanner(System.in);
int a = sc.nextInt();
int b = sc.nextInt();
new NumOP(a,b);
}
}
package com.company;
import java.math.BigDecimal;
import java.text.DecimalFormat;
public class NumOP {
public static int add(int a,int b){
return a+b;
}
public static int subtract(int a,int b){
return a-b;
}
public static int multiply(int a,int b){
return a*b;
}
public static double divide(int a,int b){
return (double) a/b;
}
public NumOP(int a,int b){
System.out.println(a+"+"+b+"="+add(a,b));
System.out.println(a+"-"+b+"="+subtract(a,b));
System.out.println(a+"*"+b+"="+multiply(a,b));
float c =(float)a;
DecimalFormat df = new DecimalFormat("0.00");
String result = df.format(divide(a,b));
System.out.println(a+"/"+b+"="+result);
}
}
3、第三题
3.1 原题再现
3.2 代码测试
package com.company;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
MyInteger myInteger = new MyInteger(5);
System.out.println(myInteger.getValue() + "是否偶数" + myInteger.isEven());
System.out.println(myInteger.getValue() + "是否奇数" + myInteger.isOdd());
System.out.println(myInteger.getValue() + "是否素数" + myInteger.isPrime());
System.out.println("12 is Prime?" + MyInteger.isEven(10));
System.out.println("12 is Even?" + MyInteger.isOdd(10));
System.out.println("12 is Prime?" + MyInteger.isPrime(10));
System.out.println("is Equal?" + myInteger.equals(5));
MyInteger myInteger1 = new MyInteger(10);
System.out.println("is Equal?" + myInteger.equals(myInteger1));
char[] chars = {
'1', '2', '3'};
System.out.println(MyInteger.parseInt(chars));
System.out.println(MyInteger.parseInt("123"));
}
}
package com.company;
import java.text.DecimalFormat;
public class MyInteger {
private int value;
public MyInteger(int v){
this.value = v;
}
public int getValue() {
return value;
}
public void setValue(int value) {
this.value = value;
}
public boolean isEven(){
return this.value%2==0;
}
public static boolean isEven(int a){
return a%2==0;
}
public boolean isOdd(){
return this.value%2==1;
}
public static boolean isOdd(int a){
return a%2==1;
}
public boolean isPrime(){
if(this.value<2) return false;
for(int i =2;i<Math.sqrt((double)this.value);i++){
if(this.value%i==0){
return false;
}
}
return true;
}
public static boolean isPrime(int num){
if(num<2) return false;
for(int i =2;i<Math.sqrt((double)num);i++){
if(num%i==0){
return false;
}
}
return true;
}
public boolean equals(int a){
return this.value == a;
}
public boolean equals(MyInteger myInteger){
return this.value == myInteger.value;
}
public static int parseInt(char[] str){
int sum = 0;
for(int i =0;i<str.length;i++){
sum += (str[i]-'0')*Math.pow(10,(str.length-1-i));
}
return sum;
}
public static int parseInt(String str){
int sum = 0;
for(int i =0;i<str.length();i++){
sum += (str.charAt(i)-'0')*Math.pow(10,(str.length()-1-i));
}
return sum;
}
}