Java 实现区块链中的区块，BLOCK的实现

package cn.wenwuyi.blockchain.pojo;/**
 * 
 * 类名：Block.java
 * 描述：区块实体类
 * 时间：2018年3月12日 下午7:03:50 
 * @author cn.wenwuyi
 * @version 1.0
 */public class Block {
    /**
     * 索引
     */
    private int    index;    /**
     * 前一个区块的hash值
     */
    private String previousHash;    /**
     * 时间戳
     */
    private long   timestamp;    /**
     * 数据，交易数据等
     */
    private String data;    /**
     * hash值
     */
    private String hash;    /**
     * nonce值（难度系数）
     */
    private long nonce;    public Block() {
    }    public Block(int index, String previousHash, long timestamp, String data, String hash,long nonce) {        this.index = index;        this.previousHash = previousHash;        this.timestamp = timestamp;        this.data = data;        this.hash = hash;        this.nonce = nonce;
    }    public int getIndex() {        return index;
    }    public void setIndex(int index) {        this.index = index;
    }    public String getPreviousHash() {        return previousHash;
    }    public void setPreviousHash(String previousHash) {        this.previousHash = previousHash;
    }    public long getTimestamp() {        return timestamp;
    }    public void setTimestamp(long timestamp) {        this.timestamp = timestamp;
    }    public String getData() {        return data;
    }    public void setData(String data) {        this.data = data;
    }    public String getHash() {        return hash;
    }    public void setHash(String hash) {        this.hash = hash;
    }    public long getNonce() {        return nonce;
    }    public void setNonce(long nonce) {        this.nonce = nonce;
    }

}