關于封裝修改屬性的問題

package com.immoc;
import com.immoc.Telphone;
public class Telphone{
private float screen;//屏幕大小
private float cpu;
private float mem;//內存大小
?public Telphone(float newScreen,float newCpu,float newMem){
??screen=newScreen;
??cpu=newCpu;
??mem=newMem;
?}
public static void main(String[] args) {
??Telphone phone2=new Telphone(5.0f,1.4f,2.0f);
??phone2.cpu=6.0f;
??System.out.println("screen:"+phone2.screen);
???? System.out.println("cpu:"+phone2.cpu);
??System.out.println("mem:"+phone2.mem);
?}
}

請問一下如果我對三個成員變量用以private修飾，為何我在main函數中修改cpu指為6.0f，為何屬性直接修改了，難道我封裝操作的不對嗎？？？？？求哥哥姐姐解答我的困惑ioioioio~~

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2018-06-10

源自：Java入門第二季 7-1

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偉楓回答被采納 +2 積分
2018-06-10

public?class?Telphone{	
????private?float?screen;//屏幕大小	
????private?float?cpu;	
????private?float?mem;//內存大小	
????public?Telphone(float?newScreen,float?newCpu,float?newMem){		
????????screen=newScreen;		
????????cpu=newCpu;		
????????mem=newMem;	
????}		
????public?static?void?main(String[]?args)?{		
????????Telphone?phone2=new?Telphone(5.0f,1.4f,2.0f);//按照參數創建了一個對象，賦初值
????????phone2.cpu=6.0f;		//修改cpu參數屬性，此時cpu=6.0，screen=5.0，mem=2.0
????????System.out.println("screen:"+phone2.screen);		
????????System.out.println("cpu:"+phone2.cpu);		
????????System.out.println("mem:"+phone2.mem);	
?????}
}

運行結果：

screen:5.0

cpu:6.0

mem:2.0