TestCar.java
public?class?TestCar?{
????public?static?void?main(String[]?args)?{
????????Car?c1?=?new?Car();
????????c1.color?=?"red";
????????c1.brand?=?"xxx";//如果這輛汽車有很多屬性，這樣一一賦值不是很麻煩？有沒有辦法一生產出來就設定它的屬性（初始化）嗎？有~~~看下面???????
????}???
}

class?Car?{
????String?color;
????String?brand;
????void?run()?{
????????System.out.printf("I?am?running...running..running~~~~\n");
????}???
????void?showMessage()?{
????????System.out.printf("汽車顏色:%s,?汽車品牌:%s\n",?color,?brand);
????}???
}

改進后的TestCar_EX.java

代碼如下:

/*什么是構造方法*/
public?class?TestCar_EX?{
????public?static?void?main(String[]?
args)?{
????????Car?c1?=?new?Car("red",?"xxx");
????}???
}
class?Car?{
????String?color;
????String?brand;
????public?Car(String?color,?String?brand)?{
????????this.color?=?
color;?????????????
//這里的this是這個對象的意思.第一個color是這個對象的color屬性，第二個是局部變量color
????????this.brand?=?
brand;?????????????//同上
????}??
????void?run()?{
????????System.out.printf("I?am?
running...running..running~~~~\n");
????}??
????void?showMessage()?{
????????System.out.printf("汽車顏色:%s,?汽車品牌:%s\n",?
color,?brand);
????}???
}

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