Java 常見(jiàn)異常ClassCastException

ClassCastException

java.lang.ClassCastException是類(lèi)型強(qiáng)制轉(zhuǎn)換異常，通常是對(duì)數(shù)據(jù)類(lèi)型進(jìn)行強(qiáng)制轉(zhuǎn)換而發(fā)生錯(cuò) 誤時(shí)引發(fā)的異常。當(dāng)一個(gè)數(shù)據(jù)類(lèi)型無(wú)法強(qiáng)制轉(zhuǎn)換成另一個(gè)數(shù)據(jù)類(lèi)型時(shí)，會(huì)拋出ClassCastException 異常。例如字符串"zuixu”無(wú)法強(qiáng)制轉(zhuǎn)換為整型數(shù)宇，當(dāng)程序嘗試強(qiáng)制轉(zhuǎn)換操作時(shí)，會(huì)拋出異常

//parent

public class Parent {

private String name;

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

}

//child

public class Child extends Parent {

private String desc;

public String getDesc() {

return desc;

}

public void setDesc(String Desc) {

this.desc = desc;

}

}

//ClassCastException異常

public class Demo {

public static void main(String[] args) {

Parent parent = new Parent();

Child child = (Child)parent;

}

}