String sourceURL = "jdbc:opengauss://127.0.0.1:8080/test?user=myuser&password=myPassWord";
C. 使用ExecutorService和Callable接口
System.out.println(resultSet.getObject("id")+" "+
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk版本号.jdk/Contents/Home
for (int i = 0; i < 5; i++) {
new PerformanceOptimization("I/O操作优化", "使用NIO等技术提高I/O操作的效率/管家婆一肖一码。"),
import com.sun.j3d.utils.geometry.ColorCube; import com.sun.j3d.utils.universe.SimpleUniverse; import javax.media.j3d.BranchGroup; import javax.media.j3d.Canvas3D; import javax.media.j3d.Transform3D; import javax.media.j3d.TransformGroup; import javax.vecmath.AxisAngle4d; import javax.vecmath.Point3d; import java.awt.*; public class Java3DDemo { public Java3DDemo() { // 创建一个简单的虚拟宇宙 SimpleUniverse universe = new SimpleUniverse(); // 创建一个Canvas3D/管家婆一肖一码，并将其添加到JFrame中 BranchGroup group = new BranchGroup(); Canvas3D canvas3D = new Canvas3D(SimpleUniverse.getPreferredConfiguration()); JFrame frame = new JFrame("Java 3D Demo"); frame.add(canvas3D, BorderLayout.CENTER); frame.setSize(800, 600); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); // 将Canvas3D添加到虚拟宇宙中 universe.addCanvas3D(canvas3D); // 创建一个旋转的TransformGroup TransformGroup tg = new TransformGroup(); Transform3D rotate = new Transform3D(); rotate.rotY(Math.PI / 4); // 初始旋转45度 tg.setTransform(rotate); // 创建一个立方体并添加到TransformGroup中 ColorCube cube = new ColorCube(0.4); // 创建一个0.4大小的彩色立方体 tg.addChild(cube); // 将TransformGroup添加到BranchGroup中 group.addChild(tg); // 将BranchGroup添加到虚拟宇宙中 universe.addBranchGraph(group); // 设置一个定时器来旋转立方体 universe.getViewingPlatform().setNominalViewingTransform(); AlphaRotation alpha = new AlphaRotation(-Math.PI, AxisAngle4d.X_AXIS); RotationInterpolator rotator = new RotationInterpolator(alpha, tg); rotator.setSchedulingBounds(new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0)); rotator.setEnablingBounds(new BoundingSphere
