jack21

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;
 
import org.mortbay.log.Log;
 

jack21

<script type="application/ld+json">
{
  "@context": "http://schema.org",
  "@type": "BreadcrumbList",
  "itemListElement": [{
    "@type": "ListItem",
    "position": 1,
    "item": {
      "@id": "FG部落格首頁網址",
      "name": "部落格"

jack21

<script type="application/ld+json">
{
    "@context": "http://schema.org",
    "@type": "BlogPosting",
    "headline": "部落格文章標題",
    "image": "該文章主圖",
    "editor": "部落客名稱",
    "publisher": "部落格名稱",
    "url": "文章網址",
    "datePublished": "文章發布時間，格式如右: 2015-09-20",

jack21

<script type="application/ld+json">
{
  "@context":"http://schema.org",
  "@type":"DiscussionForumPosting",
  "@id":"討論區文章網址",
  "headline":"討論區文章標題",
  "author": {
    "@type": "Person",
    "name": "發文者名稱"
  },

jack21

<script type="application/ld+json">
{
    "@context": "http://schema.org",
    "@type": "Product",
    "name": "評鑑商品名稱",
    "description": "",
    "url": "評鑑商品網址",
    "image": "評鑑商品圖片網址",
    "offers": {
        "@type": "Offer",

jack21

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

contract Test {
    enum Period {
        AM, PM
    }
    struct Student {
        uint no;

jack21

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

contract MappingTypeDemo {
    enum Period {
        AM, PM
    }
    struct Student {
        uint no;

jack21

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

contract MappingTypeDemo {
    mapping(bool => int) map;

    // mapping 不能是 local variable
    function mappingInLocalVariable() external view {
        // mapping(bool => int) memory map; // 打開此行會報錯

jack21

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

contract MappingDemo {
    mapping(string => uint8) scoreMap;

    function setScore(string memory name, uint8 score) external {
        scoreMap[name] = score;
    }

jack21

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

contract ArrayTypeDemo {
    // two way to declare fixed length array
    uint[5] fixedLengthArray1;
    uint[] fixedLengthArray2 = [1, 2, 3];

    // declare dynamic length array