java oop : object class

JavaOOP/src/Java27.java

@@ -0,0 +1,10 @@
+import myObject.A;
+
+public class Java27 {
+    public static void main(String[] args) {
+
+        Object o = new A();
+        ((A) o).display();
+        System.out.println(o.toString());
+    }
+}

JavaOOP/src/myObject/A.java

@@ -0,0 +1,13 @@
+package myObject;
+
+public class A{
+
+    public void display() {
+        System.out.println("A 클래스");
+    }
+
+    @Override
+    public String toString() {
+        return "재정의 메소드";
+    }
+}

react_webgame/main/Form.jsx

@@ -14,6 +14,9 @@ const Form = () => {
   const onChangeMine = useCallback((e) => {
     setMine(e.target.value);
   }, []);
+  const onClickBtn = useCallback((e) => {
+    setMine(e.target.value);
+  }, []);
 
   return (
     <div>

react_webgame/main/Table.jsx

@@ -1,17 +1,7 @@
-import React, {memo} from "react";
-import Tr from "./Tr";
+import React from "react";
 
-const Table = memo(({ tableData, dispatch }) => {
-  console.log("table rendered");
-  return (
-    <table>
-      {Array(tableData.length)
-        .fill()
-        .map((tr, i) => (
-          <Tr rowIndex={i} rowData={tableData[i]} dispatch={dispatch} />
-        ))}
-    </table>
-  );
-});
+const Table = () => {
+  return <div></div>;
+};
 
 export default Table;

react_webgame/main/Td.jsx

@@ -1,24 +1,7 @@
-import React, { useCallback, useRef, useEffect, memo } from "react";
-import { CLICK_CELL } from "./TicTacToe";
+import React from "react";
 
-const Td = memo(({ rowIndex, cellIndex, dispatch, cellData }) => {
-  console.log("td rendered")
-  
-  const ref = useRef([]);
-  useEffect(() => {
-    console.log(rowIndex === ref.current[0], cellIndex === ref.current[1], dispatch === ref.current[2], cellData === ref.current[3])
-    ref.current = [rowIndex, cellIndex, dispatch, cellData]
-  }, [rowIndex, cellIndex, dispatch, cellData])
-
-  const onClickTd = useCallback(() => {
-    console.log(rowIndex, cellIndex);
-    if(cellData) {
-      return;
-    }
-    dispatch({ type: CLICK_CELL, row: rowIndex, cell: cellIndex });
-  }, [cellData]);
-
-  return <td onClick={onClickTd}>{cellData}</td>;
-});
+const Td = () => {
+  return <div></div>;
+};
 
 export default Td;

react_webgame/main/Tr.jsx

@@ -1,20 +1,7 @@
-import React, {memo, useMemo} from "react";
-import Td from "./Td";
+import React from "react";
 
-const Tr = memo(({ rowData, rowIndex, dispatch }) => {
-  console.log("tr rendered")
-  return (
-    <tr>
-      {Array(rowData.length)
-        .fill()
-        .map((td, i) => (
-          useMemo( 
-            () => <Td rowIndex={rowIndex} cellIndex={i} dispatch={dispatch} cellData={rowData[i]} >{""}</Td>,
-            [rowData[i]],
-          )
-        ))}
-    </tr>
-  );
-});
+const Tr = () => {
+  return <div></div>;
+};
 
 export default Tr;