Form w IntelliJ

src/main/java/swing/proby_gui/Proba1.form

+<?xml version="1.0" encoding="UTF-8"?>
+<form xmlns="http://www.intellij.com/uidesigner/form/" version="1" bind-to-class="swing.proby_gui.Proba1">
+  <grid id="27dc6" layout-manager="GridLayoutManager" row-count="2" column-count="2" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">
+    <margin top="0" left="0" bottom="0" right="0"/>
+    <constraints>
+      <xy x="20" y="20" width="734" height="139"/>
+    </constraints>
+    <properties/>
+    <border type="none"/>
+    <children>
+      <component id="9b92a" class="javax.swing.JLabel">
+        <constraints>
+          <grid row="0" column="0" row-span="1" col-span="1" vsize-policy="0" hsize-policy="0" anchor="8" fill="0" indent="0" use-parent-layout="false"/>
+        </constraints>
+        <properties>
+          <text value="Podaj swoje imię"/>
+        </properties>
+      </component>
+      <component id="defba" class="javax.swing.JTextField" binding="textField1" default-binding="true">
+        <constraints>
+          <grid row="0" column="1" row-span="1" col-span="1" vsize-policy="0" hsize-policy="6" anchor="8" fill="1" indent="0" use-parent-layout="false">
+            <preferred-size width="150" height="-1"/>
+          </grid>
+        </constraints>
+        <properties/>
+      </component>
+      <component id="7d509" class="javax.swing.JButton" binding="OKButton" default-binding="true">
+        <constraints>
+          <grid row="1" column="0" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
+        </constraints>
+        <properties>
+          <text value="OK"/>
+        </properties>
+      </component>
+      <component id="b39c5" class="javax.swing.JLabel">
+        <constraints>
+          <grid row="1" column="1" row-span="1" col-span="1" vsize-policy="0" hsize-policy="0" anchor="8" fill="0" indent="0" use-parent-layout="false"/>
+        </constraints>
+        <properties>
+          <text value=""/>
+        </properties>
+      </component>
+    </children>
+  </grid>
+</form>

src/main/java/swing/proby_gui/Proba1.java

+package swing.proby_gui;
+
+import javax.swing.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+public class Proba1 {
+    private JTextField textField1;
+    private JButton OKButton;
+public Proba1() {
+    OKButton.addActionListener(new ActionListener() {
+        @Override
+        public void actionPerformed(ActionEvent e) {
+            String imie = textField1.getText();
+
+        }
+    });
+}
+}

src/main/java/swing/rysowanie/Rysowanie2D.java

@@ -51,9 +51,11 @@ public class Rysowanie2D {
 		
 		protected void paintComponent(Graphics g) {
 			super.paintComponent(g);
-			
-			if(g instanceof Graphics2D) {
-				Graphics2D g2 = (Graphics2D)g;
+
+			// Nowa możliwość Javy: rzutowanie bezpośrednio w instanceof
+			// ("pattern matching")
+			if(g instanceof Graphics2D g2) {
+				//Graphics2D g2 = (Graphics2D)g;
 				
 				AffineTransform pustyTrans = g2.getTransform();