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摘要：構(gòu)造方法寫(xiě)法構(gòu)造方法特征無(wú)參的構(gòu)造方法無(wú)參的構(gòu)造方法有參的構(gòu)造方法無(wú)參的構(gòu)造方法有參的構(gòu)造方法構(gòu)造方法給對(duì)象的屬性一個(gè)合理的值無(wú)參的構(gòu)造方法你的參數(shù)有誤有參的構(gòu)造方法效果
構(gòu)造方法寫(xiě)法 構(gòu)造方法特征 無(wú)參的構(gòu)造方法
/javaDemo2/src/com/imooc/Telphone.java
package com.imooc;
public class Telphone {
public Telphone() {
System.out.println("無(wú)參的構(gòu)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(gòu)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(wú)參的構(gòu)造方法");
}
public Telphone(float newScreen,float newCpu) {
screen = newScreen;
cpu = newCpu;
System.out.println("有參的構(gòu)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(gòu)造方法給對(duì)象的屬性一個(gè)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(wú)參的構(gòu)造方法");
}
public Telphone(float newScreen,float newCpu) {
if(newScreen <3.5f) {
System.out.println("你的參數(shù)有誤");
screen = 3.5f;
}
screen = newScreen;
cpu = newCpu;
System.out.println("有參的構(gòu)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
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