小编por*_*che的帖子

我有这个代码：

public class Tray {

private Set<Block> blocks;

private int numColumns;
private int numRows;

//constructor
public Tray (int numRows, int numColumns){
    this.numColumns = numColumns;
    this.numRows = numRows;
    blocks = new HashSet<>();
}

public boolean satisfiesGoal(Tray other){

    Block thisBlock = this.blocks.iterator().next();
    Block otherBlock = other.blocks.iterator().next();

    boolean hashesEqual = thisBlock.hashCode() == otherBlock.hashCode(); // this is true

    boolean areEqual = thisBlock.equals(otherBlock) && otherBlock.equals(thisBlock); // this is true

    boolean contains = this.blocks.contains(otherBlock); // this is false, why?
    return contains;
}

在主要方法中，我已将 2 个块添加到各自的托盘中。根据调试器，变量“hashesEqual”和“areEqual”为真，但布尔值“contains”为假。关于为什么根据“equals”方法，2 个对象的哈希值会相等，但不会在 …