added Flat*Laf.install() methods

CHANGELOG.md

@@ -3,6 +3,7 @@ FlatLaf Change Log
 
 ## Unreleased
 
+- Added `Flat*Laf.install()` methods.
 - macOS: Use native screen menu bar if system property
   `apple.laf.useScreenMenuBar` is `true`.
 

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatDarculaLaf.java

@@ -24,6 +24,10 @@ package com.formdev.flatlaf;
 public class FlatDarculaLaf
 	extends FlatDarkLaf
 {
+	public static boolean install( ) {
+		return install( new FlatDarculaLaf() );
+	}
+
 	@Override
 	public String getName() {
 		return "Flat Darcula";

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatDarkLaf.java

@@ -24,6 +24,10 @@ package com.formdev.flatlaf;
 public class FlatDarkLaf
 	extends FlatLaf
 {
+	public static boolean install( ) {
+		return install( new FlatDarkLaf() );
+	}
+
 	@Override
 	public String getName() {
 		return "Flat Dark";

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatIntelliJLaf.java

@@ -24,6 +24,10 @@ package com.formdev.flatlaf;
 public class FlatIntelliJLaf
 	extends FlatLightLaf
 {
+	public static boolean install( ) {
+		return install( new FlatIntelliJLaf() );
+	}
+
 	@Override
 	public String getName() {
 		return "Flat IntelliJ";

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatLaf.java

@@ -39,6 +39,7 @@ import java.util.function.Function;
 import javax.swing.AbstractButton;
 import javax.swing.JLabel;
 import javax.swing.JTabbedPane;
+import javax.swing.LookAndFeel;
 import javax.swing.SwingUtilities;
 import javax.swing.UIDefaults;
 import javax.swing.UIManager;
@@ -73,6 +74,16 @@ public abstract class FlatLaf
 	private AWTEventListener mnemonicListener;
 	private static boolean altKeyPressed;
 
+	public static boolean install( LookAndFeel newLookAndFeel ) {
+		try {
+		    UIManager.setLookAndFeel( newLookAndFeel );
+		    return true;
+		} catch( Exception ex ) {
+		    System.err.println( "Failed to initialize look and feel " + newLookAndFeel.getClass().getName() );
+		    return false;
+		}
+	}
+
 	@Override
 	public String getID() {
 		return getName();

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatLightLaf.java

@@ -24,6 +24,10 @@ package com.formdev.flatlaf;
 public class FlatLightLaf
 	extends FlatLaf
 {
+	public static boolean install( ) {
+		return install( new FlatLightLaf() );
+	}
+
 	@Override
 	public String getName() {
 		return "Flat Light";

flatlaf-core/src/test/java/com/formdev/flatlaf/FlatTestFrame.java

@@ -68,11 +68,7 @@ public class FlatTestFrame
 			ex.printStackTrace();
 
 			// fallback
-			try {
+			FlatLightLaf.install();
-				UIManager.setLookAndFeel( new FlatLightLaf() );
-			} catch( Exception ex2 ) {
-				ex2.printStackTrace();
-			}
 		}
 
 		// create frame

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/FlatLafDemo.java

@@ -46,11 +46,7 @@ public class FlatLafDemo
 			ex.printStackTrace();
 
 			// fallback
-			try {
+			FlatLightLaf.install();
-				UIManager.setLookAndFeel( new FlatLightLaf() );
-			} catch( Exception ex2 ) {
-				ex2.printStackTrace();
-			}
 		}
 
 		// create frame