对于继承封装的理解



一封装

把对象信息，内部逻辑结构隐藏起来

private 只能在当前内部被访问

default可以被同个包其他类访问

protected

public

this 在方法内需要调用方法对象时

二，继承

由已有类派发出新类，新类吸收已有类的属性和行为，并扩展新的能力

具有传递性

单一性

package继承;

publicclassBird {

       privateStringname;

       publicString getName() {

             returnname;

       }

       publicvoidsetName(Stringname) {

             this.name=name;

       }

       publicString getColor() {

             returncolor;

       }

       publicvoidsetColor(Stringcolor) {

             this.color=color;

       }

       publicString getWeight() {

             returnweight;

       }

       publicvoidsetWeight(Stringweight) {

             this.weight=weight;

       }

       privateStringcolor;

       privateStringweight;

       publicvoidfly(){

             System.out.println("飞翔");

       }

       publicvoidfoot(){

             System.out.println("走路");

       }

       

       

}

package继承;

publicclassDayanextendsBird {

       

}

package继承;

publicclassTest {

       publicstaticvoidmain(String[]args) {

             //TODOAuto-generated method stub

             Dayandayan=newDayan();

             dayan.setColor("黄色");

             System.out.println(dayan.getColor());

             dayan.fly();

             dayan.foot();

       }

}