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###質問
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MinecraftのPluginの作成をしていたのですが、`b.getType().equals(Material.EMERALD_BLOCK`のequalsがわかりません。＝＝と何が違うのでしょうか？超初心者なので、極力分かりやすくお願いします。
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```java
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public class EventsClass implements Listener{
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@EventHandler
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public void onInteract(PlayerInteractEvent event) {
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Action a = event.getAction();
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Player p = event.getPlayer();
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Block b = event.getClickedBlock();
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if(a.equals(Action.LEFT_CLICK_BLOCK)) {
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if(b.getType().equals(Material.EMERALD_BLOCK)) {
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p.sendMessage(ChatColor.LIGHT_PURPLE + "test");
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if(p.getHealth() == 20) {
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}
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}else {
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}
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}
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}
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}
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```
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