java - equals/Arrays.deepequals 在相同数组上返回 false

Question

我正在尝试测试两个数组是否相同，我打印了它们内部的每个值，您可以看到这些值是相同的，但由于某种原因，相等测试总是返回 false。我尝试过使用 equals 以及 Arrays.deepEquals，但这两种方法都不起作用。

这是我的代码:

System.out.println("========");
for (int i = 0; i < row.length; i++) {
    System.out.println("----------");
    System.out.println(row[i].getAlias());
    System.out.println(row[i].getDisplay());
    System.out.println(row[i].getModify());
    System.out.println(row[i].getName());
    System.out.println(row[i].getType());
    System.out.println(row[i].getOp());
    System.out.println(row[i].getValue());
    System.out.println("----------");
}
System.out.println("========");

for (ResultContainer rc : editedResultsList) {
    System.out.println("========");
    for (int i = 0; i < rc.getResult().length; i++) {
        System.out.println("----------");
        System.out.println(rc.getResult()[i].getAlias());
        System.out.println(rc.getResult()[i].getDisplay());
        System.out.println(rc.getResult()[i].getModify());
        System.out.println(rc.getResult()[i].getName());
        System.out.println(rc.getResult()[i].getType());
        System.out.println(rc.getResult()[i].getOp());
        System.out.println(rc.getResult()[i].getValue());
        System.out.println("----------");
    }
    System.out.println("========");
    System.out.println(rc.getResult().equals(row));
    System.out.println(Arrays.deepEquals(rc.getResult(), row));
    System.out.println(rc.getResult() == row);

    if (rc.getResult().equals(row)) {
         editedResultsList.remove(rc);
    }
}

这是输出:

========
----------
null
false
false
mep_ident
NUMBER
insert
0
----------
----------
Numéro Partenaire
true
true
mep_ptrpartident
NUMBER
insert
000
----------
----------
Numéro Produit
true
true
mep_ptrpasident
NUMBER
insert
111
----------
----------
Code Document
true
true
mep_code_doc
VARCHAR2
insert
222
----------
----------
Production ?
true
true
mep_production
VARCHAR2
insert
333
----------
========
========
----------
null
false
false
mep_ident
NUMBER
insert
0
----------
----------
Numéro Partenaire
true
true
mep_ptrpartident
NUMBER
insert
000
----------
----------
Numéro Produit
true
true
mep_ptrpasident
NUMBER
insert
111
----------
----------
Code Document
true
true
mep_code_doc
VARCHAR2
insert
222
----------
----------
Production ?
true
true
mep_production
VARCHAR2
insert
333
----------
========
false
false
false
true

Answer 1

来自Javadoc :

Two possibly null elements e1 and e2 are deeply equal if any of the following conditions hold:
- e1 and e2 are both arrays of object reference types, and Arrays.deepEquals(e1, e2) would return true
- e1 and e2 are arrays of the same primitive type, and the appropriate overloading of Arrays.equals(e1, e2) would return true.
- e1 == e2
- e1.equals(e2) would return true.

关于数组中对象的类，请确保正确覆盖 equals() 和 hashcode()。

更新

咨询Object javadoc ，基本上你需要将其添加到你的类中:

@Override
public boolean equals(Object other) {
    // Add here code to verifiy that this object is "equals"
    // to the method argument "other".
    // return true if they are equal or false otherwise
}

@Override
public int hashCode() {
    // Return here a "hash" integer (two objects equals to each other
    // must return the same hashcode)
}