为什么我收到stackoverflow错误？
我的课 –
- public class Tester {
- int id;
- Tester(int id){
- this.id = id;
- }
- public String toString(){
- String rep = "Hex: " + this + ",Id: " + this.id;
- return rep;
- }
- }
主要方法 –
- class Driver{
- public static void main(String [] args){
- Tester t = new Tester(123);
- System.out.println(t);
- }
- }
错误 –
- Exception in thread "main" java.lang.StackOverflowError
- at java.lang.String.length(Unknown Source)
- at java.lang.AbstractStringBuilder.append(Unknown Source)
- at java.lang.StringBuilder.append(Unknown Source)
- at java.lang.StringBuilder.<init>(Unknown Source)
- at com.examscam.model.Tester.toString(Tester.java:13)
- at java.lang.String.valueOf(Unknown Source)
- at java.lang.StringBuilder.append(Unknown Source)
- ---------REPEAT !!!
解决方法
你写了：
- String rep = "Hex: " + this + ",Id: " + this.id;
在java中简单地写这意味着你间接调用this.toString().
我相信您正在尝试覆盖Object的toString()方法,并且在您的toString()版本中,您希望打印已传递的ID以及对象的哈希码.
所以要取代输出
- String rep = "Hex: " + this + ",Id: " + this.id;
同
- String rep = "Hex: "+ this.getClass().getName().hashCode() +",Id: " + id;
你会得到输出：
- Hex: 1800024669,Id: 123
