getmaxminvalue.java

《J2ME图形显示基础》中第一章

/*
 * GetMaxMinValue.java
 *
 * Created on 2005年1月31日, 下午3:59
 */

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

/**
 * 显示基本数据类型的最大值和最小值
 * <p>
 * @author  刘斌
 * @version
 */
public class GetMaxMinValue extends MIDlet {
    private Form form = new Form("显示最大最小值");
    
    public void startApp() {
        Display.getDisplay(this).setCurrent(form);
        outputMinMaxValue();
    }
    
    public void pauseApp() {
    }
    
    public void destroyApp(boolean unconditional) {
    }
    
    /**
     * 显示最大最小值
     */
    private void outputMinMaxValue() {
        String osMin, osMax;
        
        osMax = "int最大值：" + Integer.MAX_VALUE;
        osMin = "int最小值：" + Integer.MIN_VALUE;
        out(osMax);
        out(osMin);
 
        osMax = "short最大值：" + Short.MAX_VALUE;
        osMin = "short最小值：" + Short.MIN_VALUE;
        out(osMax);
        out(osMin);

        osMax = "byte最大值：" + Byte.MAX_VALUE;
        osMin = "byte最小值：" + Byte.MIN_VALUE;
        out(osMax);
        out(osMin);

        osMax = "long最大值：" + Long.MAX_VALUE;
        osMin = "long最小值：" + Long.MIN_VALUE;
        out(osMax);
        out(osMin);

        osMax = "char最大值：" + (int)Character.MAX_VALUE;
        osMin = "char最小值：" + (int)Character.MIN_VALUE;
        out(osMax);
        out(osMin);

        osMax = "float最大值：" + Float.MAX_VALUE;
        osMin = "float最小值：" + Float.MIN_VALUE;
        out(osMax);
        out(osMin);

        osMax = "double最大值：" + Double.MAX_VALUE;
        osMin = "double最小值：" + Double.MIN_VALUE;
        out(osMax);
        out(osMin);        
    }
    
    /**
     * 在标准输出和窗口中输出信息
     */
    private void out(String msg) {
        System.out.println(msg);
        form.append(msg+"\n");
    }
}