我这段代码是否正确体现了构造方法？

[djliu2]

public class Number38 {
int chang;
int kuan;
int mianji;
public Number38(int chang,int kuan){
this.chang=5;
this.kuan=4;
}
public int mianji(){
mianji=(chang*kuan);
return mianji;
}
}

[打不打伞心都是湿的-_-]

  9 public class Number38 {
  8     private int chang  = 0;
  7     private int kuan   = 0;
  6     private int mianji = 0;
  5     public Number38(int chang, int kuan ){   
  4     ¦   this.chang=5;
  3     ¦   this.kuan=4;
  2     ¦   mianji = chang * kuan;
  1     }   
  0     public int getMianji(){
  1     ¦   return mianji;
  2     }   
  3 } 

[打不打伞心都是湿的-_-]

嗯嗯嗯，是的...

  4 public class Number38 {
  3     private int chang  = 0;
  2     private int kuan   = 0;
  1     private int mianji = 0;
  0     public Number38(int chang, int kuan ){   
  1     ¦   this.chang=5;
  2     ¦   this.kuan=4;
  3     ¦   mianji = chang * kuan;
  4     }   
  5     public int calculateMianji(){
  6     ¦   return mianji;
  7     }   
  8 } 

[qq_34324650]

public class Number38 { private int chang = 0; private int kuan = 0; public Number38( ){ chang = 5; kuan = 4; } public Number38(int chang, int kuan){ this.chang = chang; this.kuan = kuan; } public int getMianji(){ return chang*kuan; } } 调用方式如：Number38 a = new Number38(); Number38 b = new Number38(10,8);

[constant_f]

你直接把长宽给顶死了，你这个构造函数没意义了把？

[djliu2]

引用 3楼qq_34324650 的回复:

public class Number38 { private int chang = 0; private int kuan = 0; public Number38( ){ chang = 5; kuan = 4; } public Number38(int chang, int kuan){ this.chang = chang; this.kuan = kuan; } public int getMianji(){ return chang*kuan; } } 调用方式如：Number38 a = new Number38(); Number38 b = new Number38(10,8);

这个调用方式怎么说 我是小白

[djliu2]

引用 4楼constant_f 的回复:

你直接把长宽给顶死了，你这个构造函数没意义了把？

不是很理解 能详细说说么

[Alphathur]

长宽都限制死了

[尼古拉斯-全蛋]

引用 3 楼 qq_34324650 的回复:

public class Number38 { private int chang = 0; private int kuan = 0; public Number38( ){ chang = 5; kuan = 4; } public Number38(int chang, int kuan){ this.chang = chang; this.kuan = kuan; } public int getMianji(){ return chang*kuan; } } 调用方式如：Number38 a = new Number38(); Number38 b = new Number38(10,8);

+1

[疯雪]

构造方法目的是给成员变量初始化用的，在这里你可以有两个构造方法，

public Number38(){
chang = 3;
kuan = 4;
}
public Number38(int chang,int kuan){
this.chang = chang;
this.kuan = kuan;
}

另外变量定义的时候建议使用英文单词

[chaser401]

是构造方法，但是不能通过方法赋值

[tangxheng]

package test; public class Number38 { int chang; int kuan; int mianji; public Number38(){ } public Number38(int chang, int kuan) { this.chang = 5; this.kuan = 4; } public int mianji() { mianji = (chang * kuan); return mianji; } public int getChang() { return chang; } public void setChang(int chang) { this.chang = chang; } public int getKuan() { return kuan; } public void setKuan(int kuan) { this.kuan = kuan; } public int getMianji() { return mianji; } public void setMianji(int mianji) { this.mianji = mianji; } }

[tangxheng]

package test; public class Number38 { int chang; int kuan; int mianji; public Number38(){ } public Number38(int chang, int kuan) { this.chang = chang; this.kuan = kuan; } public int mianji() { mianji = (chang * kuan); return mianji; } public int getChang() { return chang; } public void setChang(int chang) { this.chang = chang; } public int getKuan() { return kuan; } public void setKuan(int kuan) { this.kuan = kuan; } public int getMianji() { return mianji; } public void setMianji(int mianji) { this.mianji = mianji; } }

[bajinggong]

构造方法用来初始化字段，计算面积另外写代码。

[天皇101]

名字里有数字没关系吧

[linglingj0]

this指代的是该类所new出来的对象, this.chang代表你new出来对象里面的成员变量chang. 而你构造函数里面的参数chang只是一个 形式,写什么都可以 当你通过new number(5,4)来创建对象时, 由于你构造函数里面已经把5和4写死了直接付给对象里面的成员变量chang和kuan 所以此时你的构造函数并没体现出它的用处new number(?,?) 里面两个问号无论填什么都对你的函数运行的返回值没有影响, 也就是说你现在写的函数除了算出5x4等于几以外并没有什么卵用.

[HerveyHall]

LZ应该是这个意思：

public class Number38 {
    int chang;
    int kuan;
    public Number38(){
       this(5,4);
    }
    public Number38(int chang,int kuan){
       this.chang=chang;
       this.kuan=kuan;    
    }
    public int mianji(){
       return chang*kuan;
    }
}