我看到大多数时候在DTO对象中,
toString 方法实际上被重写了。
例如 :
public class Person implements Serializable {
private String firstName;
private String lastName;
private int age;
/**
* Creates a new instance of Person
*/
public Person() {
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
//Overriding toString to be able to print out the object in a readable way
//when it is later read from the file.
public String toString() {
StringBuffer buffer = new StringBuffer();
buffer.append(firstName);
buffer.append("\n");
buffer.append(lastName);
buffer.append("\n");
buffer.append(age);
buffer.append("\n");
return buffer.toString();
}
}
有人可以告诉我这样做有什么用吗?
答案就在你的代码注释中。调试时,您希望能够打印对象的人类可读表示。如果你不覆盖toString
您很可能会得到如下的表示:
Person@129cfbb
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