datatype3.java~7~

提供了常用的JAVA技术的示例

package datatype3;

import javax.swing.UIManager;


public class datatype3 {
  boolean packFrame = false;


  //Construct the application
  public datatype3() {
    Frame3 frame = new Frame3();

    //Validate frames that have preset sizes
    //Pack frames that have useful preferred size info, e.g. from their layout
    if (packFrame) {
      frame.pack();
    }
    else {
      frame.validate();
    }
    frame.setVisible(true);
  }
  //Main method
  public static void main(String[] args) {
    JFrame frame=new JFrame("java");
    System.out.println("integer.max_value="+Integer.MAX_VALUE);
    System.out.println("integer.min_value="+Integer.MIN_VALUE);
    System.out.println("long.max_value="+Long.MAX_VALUE);
    System.out.println("long.min_value="+Long.MIN_VALUE);
    System.out.println("float.max_value="+Float.MAX_VALUE);
    System.out.println("float.min_value="+Float.MIN_VALUE);
    System.out.println("double.max_value="+Double.MAX_VALUE);
    System.out.println("double.min_value="+Double.MIN_VALUE);
    System.out.println("Float.POSITIVE_INFINITY="+Float.POSITIVE_INFINITY);
    System.out.println("Float.NEGATIVE_INFINITY="+Float.NEGATIVE_INFINITY);
    System.out.println("Double.POSITIVE_INFINITY"+Double.POSITIVE_INFINITY);
    System.out.println("Double.NEGATIVE_INFINITY="+Double.NEGATIVE_INFINITY);
    System.out.println("Float.NaN="+Float.NaN);
    System.out.println("Double.NaN="+Double.NaN);


    try {
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    }
    catch(Exception e) {
      e.printStackTrace();
    }
    new datatype3();
  }
}