feat(common): 添加新工具

hamster-core-common/src/main/java/cn/hamster3/mc/plugin/core/common/util/Pair.java

@@ -0,0 +1,43 @@
+package cn.hamster3.mc.plugin.core.common.util;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.io.Serializable;
+import java.util.Objects;
+
+@SuppressWarnings("unused")
+public class Pair<K, V> implements Serializable {
+    @NotNull
+    private final K key;
+
+    @NotNull
+    private final V value;
+
+    public Pair(@NotNull K key, @NotNull V value) {
+        this.key = key;
+        this.value = value;
+    }
+
+    @NotNull
+    public K getKey() {
+        return key;
+    }
+
+    @NotNull
+    public V getValue() {
+        return value;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Pair<?, ?> pair = (Pair<?, ?>) o;
+        return key.equals(pair.key) && value.equals(pair.value);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(key, value);
+    }
+}