switch new Random.nextInt(3) {
    case 0:return 'r';case 1:return 'p';case 2:return 's';
}

Error:Abnormal build process termination:
"C:\Program Files\Java\jdk-9\bin\java" -Xmx700m -Djava.awt.headless=true -Djdt.compiler.useSingleThread=true -Dcompile.parallel=false -Drebuild.on.dependency.change=true -Djava.net.preferIPv4Stack=true -Dio.netty.initialSeedUniquifier=5506676748000734276 -Djava.ext.dirs=\"\" -Dfile.encoding=windows-1252 -Djps.file.types.component.name=CommunityFileTypes -Duser.language=en -Duser.country=US -Didea.paths.selector=IdeaIC2016.3 "-Didea.home.path=C:\Program Files (x86)\JetBrains\IntelliJ IDEA Community Edition 2016.3" -Didea.config.path=C:\Users\Pavel\.I…

package com.qwerpderp.lonetree;

import static org.lwjgl.glfw.GLFW.*;
import static org.lwjgl.opengl.GL11.*;
import org.lwjgl.glfw.GLFWVidMode;
import org.lwjgl.opengl.GL;

public class Main {
    public static void main(String[] args) {
        if (!glfwInit()) {
            throw new IllegalStateException("Failed to access GLFW.");
        }

        glfwWindowHint(GLFW_VISIBLE, 0);
        long window = glfwCreateWindow(800, 600, "Hello World", 0, 0);

        if (window == 0) {
            throw new IllegalStateException("Failed to open window.");

glEnable(GL11.GL_TEXTURE_2D);
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glEnable(GL11.GL_BLEND);
glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
glViewport(0,0,width,height);
glMatrixMode(GL11.GL_MODELVIEW);
glMatrixMode(GL11.GL_PROJECTION);
glLoadIdentity();
glOrtho(0, width, height, 0, 1, -1);
glMatrixMode(GL11.GL_MODELVIEW);