class Number {
float num1;
float num2;
void addition(){
double addition=num1+num2;
System.out.println("N1+N2結(jié)果為：" + addition);
}
void subtration(){
double subtration=num1-num2;
System.out.println("N1-N2結(jié)果為：" + subtration);
}
void multiplication(){
float multiplication=num1*num2;
System.out.println("N1*N2結(jié)果為：" + multiplication);
}
void division(){
float division=num1/num2;
System.out.println("N1/N2結(jié)果為：" + division);
}
}
1 import java.util.Scanner;
2
3 public class Number_main {
4
5 public static void main(String[] args) {
6 Number num1=new Number();
7 Number num2=new Number();
8 Number num3=new Number();
9 Number num4=new Number();
10
11 Scanner input=new Scanner(System.in);
12 System.out.println("輸入兩個值來計算加減乘除：");
13 float n1 = input.nextInt();
14 Scanner input2=new Scanner(System.in);
15 System.out.println("輸入第二個值：");
16 float n2 = input.nextInt();
17
18 num1.addition();
19 num2.subtration();
20 num3.division();
21 num4.multiplication();
22
23 }
24
25 }
輸入兩個值來計算加減乘除：5輸入第二個值：4N1+N2結(jié)果為：0.00.0
N1-N2結(jié)果為：0.0
N1/N2結(jié)果為：NaNN1*N2結(jié)果為：0.0
為什么會出現(xiàn)這樣的情況？怎么樣才能根據(jù)題目做出來，是我的想法有問題嗎？
8 回答
慕勒3428872
TA貢獻(xiàn)1848條經(jīng)驗 獲得超6個贊
你就沒給你的Number對象的兩個數(shù)字賦值過你說怎么可能得出正確答案？
ps：標(biāo)題長的確顯眼。。。。
白衣染霜花
TA貢獻(xiàn)1796條經(jīng)驗 獲得超10個贊
@窗外雨，夜微寒。: 簡單點你把那兩個字段public出來，要么去掉那兩個字段，降到方法上
class Number
{
void multiplication(float num1,float num2){
float multiplication=num1*num2;
System.out.println("N1*N2結(jié)果為：" + multiplication);
}
//..依次類推
}
外邊直接當(dāng)入?yún)魅刖涂梢粤?，new那么多Number實例沒用。
人到中年有點甜
TA貢獻(xiàn)1895條經(jīng)驗 獲得超7個贊
根據(jù)面向?qū)ο蟮脑O(shè)計原則，你可以這樣寫：
public class Number {
float value;
Number addition(Number num){
double addition=this.value+num.value;
System.out.println("N1+N2結(jié)果為：" + addition);
return this;
}
Number subtration(Number num){
double subtration=this.value-num.value;
System.out.println("N1-N2結(jié)果為：" + subtration);
return this;
}
Number multiplication(Number num){
float multiplication=this.value*num.value;
System.out.println("N1*N2結(jié)果為：" + multiplication);
return this;
}
Number division(Number num){
float division=this.value/num.value;
System.out.println("N1/N2結(jié)果為：" + division);
return this;
}
Number(float f){
this.value = f ;
}
public static void main(String[] args) {
Number number1 = new Number(4);
Number number2 = new Number(5);
number1.addition(number2)
.subtration(number2)
.division(number2)
.multiplication(number2);
}
}
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