java入門第二季--第1章 類和物件--java中的構造方法
摘要：
構造方法寫法
構造方法特徵
無參的構造方法
/javaDemo2/src/com/imooc/Telphone.java
package com.imooc;
public class Tel...
構造方法寫法
構造方法特徵
無參的構造方法
/javaDemo2/src/com/imooc/Telphone.java
package com.imooc;
public class Telphone {
public Telphone() {
System.out.println("無參的構造方法");
}
}
/javaDemo2/src/com/imooc/InitailTelphone.java
package com.imooc;
public class InitailTelphone {
public static void main(String[] args) {
// TODO Auto-generated method stub
Telphone phone =new Telphone();
}
}
有參的構造方法
/javaDemo2/src/com/imooc/Telphone.java
package com.imooc;
import com.sun.glass.ui.Screen;
public class Telphone {
float screen;
float cpu;
public Telphone() {
System.out.println("無參的構造方法");
}
public Telphone(float newScreen,float newCpu) {
screen = newScreen;
cpu = newCpu;
System.out.println("有參的構造方法");
}
}
/javaDemo2/src/com/imooc/InitailTelphone.java
package com.imooc;
public class InitailTelphone {
public static void main(String[] args) {
// TODO Auto-generated method stub
Telphone phone =new Telphone();
Telphone phone2 =new Telphone(5.0f,1.4f);
}
}
構造方法給物件的屬性一個合理的值
/javaDemo2/src/com/imooc/Telphone.java
package com.imooc;
import com.sun.glass.ui.Screen;
public class Telphone {
float screen;
float cpu;
public Telphone() {
System.out.println("無參的構造方法");
}
public Telphone(float newScreen,float newCpu) {
if(newScreen <3.5f) {
System.out.println("你的引數有誤");
screen = 3.5f;
}
screen = newScreen;
cpu = newCpu;
System.out.println("有參的構造方法");
}
}
/javaDemo2/src/com/imooc/InitailTelphone.java
package com.imooc;
public class InitailTelphone {
public static void main(String[] args) {
// TODO Auto-generated method stub
Telphone phone =new Telphone();
Telphone phone2 =new Telphone(1.5f,1.4f);
}
}
效果
