本文實(shí)例講述了Java中父類和子類之間的轉(zhuǎn)換操作。分享給大家供大家參考，具體如下：

package learn20180720; public class People { private String name; private Integer age; private Double height; public People(){ this.name = ''; this.age = 0 ; this.height = 0.0; } public People(String name, Integer age, Double height) { super(); this.name = name; this.age = age; this.height = height; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } public Double getHeight() { return height; } public void setHeight(Double height) { this.height = height; } public void tellObjectName(People p) { System.err.println(p.name); } public void sayInformation() { System.err.println('我的名字叫做：'+this.name+'我的年齡是：'+this.age+'我的身高是'+this.height); }}

package learn20180720;public class Chinese extends People{ private String country; public Chinese(){ super(); country = ''; } public Chinese(String aname,Integer aage,Double aheight) { super(aname,aage,aheight); this.country = '中國(guó)'; } public String getCountry() { return country; } public void setCountry(String country) { this.country = country; } public void sayInformation() { // TODO Auto-generated method stub System.err.println('我的名字叫做：'+this.getName()+' 我的年齡是：'+this.getAge()+' 我的身高是：'+this.getHeight()+' 我的國(guó)家是：'+this.country); }}

package learn20180720;public class TestPeCh { public static void main(String[] args) { // TODO Auto-generated method stub People p1 = new Chinese(); Chinese c1 = (Chinese)p1; }}

可以看到，p1無(wú)法訪問(wèn)子類中的特有的方法（父類引用可以訪問(wèn)子類中重寫父類中的方法），但是強(qiáng)轉(zhuǎn)成為子類類型的引用c1之后，c1就可以訪問(wèn)子類中所有的方法啦。

package learn20180720;public class TestPeCh { public static void main(String[] args) { // TODO Auto-generated method stub People p1 = new People(); Chinese c1 = (Chinese)p1; }}

報(bào)錯(cuò)了！

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希望本文所述對(duì)大家java程序設(shè)計(jì)有所幫助。