Question

我完全迷失了。我必须创建一个公共分类帐，其当前的UTXOPool（未使用的事务输出集合）是{@code utxoPool}。这应该使用UTXOPool（UTXOPool uPool）构造函数制作utxoPool的副本。我的代码粘贴在下面..

    public class TxHandler {

    /**
    * Creates a public ledger whose current UTXOPool (collection of unspent        transaction outputs) is
 * {@code utxoPool}. This should make a copy of utxoPool by using the UTXOPool(UTXOPool uPool)
 * constructor.
 */
public TxHandler(UTXOPool utxoPool) {
    // IMPLEMENT THIS
    this.

}

/**
 * @return true if:
 * (1) all outputs claimed by {@code tx} are in the current UTXO pool, 
 * (2) the signatures on each input of {@code tx} are valid, 
 * (3) no UTXO is claimed multiple times by {@code tx},
 * (4) all of {@code tx}s output values are non-negative, and
 * (5) the sum of {@code tx}s input values is greater than or equal to the sum of its output
 *     values; and false otherwise.
 */
public boolean isValidTx(Transaction tx) {
    // IMPLEMENT THIS
}

/**
 * Handles each epoch by receiving an unordered array of proposed transactions, checking each
 * transaction for correctness, returning a mutually valid array of accepted transactions, and
 * updating the current UTXO pool as appropriate.
 */
public Transaction[] handleTxs(Transaction[] possibleTxs) {
    // IMPLEMENT THIS
}

}

Answer 1

如果另一个类放在另一个包中，则需要确保初始类和要调用的方法都是公共的，然后在另一个类中需要导入初始类：< / p>

import your.original.package.TxHandler;

然后调用它的方法。

Answer 2

从指令 - “这应该使用UTXOPool（UTXOPool uPool）构造函数制作utxoPool的副本。”

所以你的构造函数应该是这样的

public TxHandler(UTXOPool utxoPool) {
// IMPLEMENT THIS
this.utxoPool = new UTXOPool(utxoPool)

}

我想从另一个类调用构造函数和方法

2 个答案: