import javax.swing.JOptionPane;


/**
 * @author Gubowen
 *课本习题 P74  3.3
 */
public class test_01_for3_3 {
    public static void main (String[] args){
        int num=Integer.parseInt(JOptionPane.showInputDialog(null,"请输入一个数","请输入一个数",JOptionPane.QUESTION_MESSAGE));
        
        if (num%5==0 && num%6==0)
            System.out.println("Is "+num+" divisible by 5 and 6? true");
        else
            System.out.println("Is "+num+" divisible by 5 and 6? false");
        
        if (num%5==0 || num%6==0)
            System.out.println("Is "+num+" divisible by 5 and 6? true");
        else
            System.out.println("Is "+num+" divisible by 5 and 6? false");
        
        if (num%5==0 ^ num%6==0)
            System.out.println("Is "+num+" divisible by 5 and 6,but not both? true");
        else
            System.out.println("Is "+num+" divisible by 5 and 6,but not both? false");
    }

}

import javax.swing.JOptionPane;
 
 
/**
 * @author 张弛
 *课本习题 P74  3.3
 */
public class sfdsfs {
    public static void main (String[] args){
        String st=JOptionPane.showInputDialog(null,"请输入一个数","请输入一个数",JOptionPane.QUESTION_MESSAGE);
        int num=Integer.parseInt(st);
        boolean i=(num%5==0 && num%6==0);
            System.out.println("Is "+num+" divisible by 5 and 6? "+i);
            boolean j=(num%5==0 || num%6==0);
            System.out.println("Is "+num+" divisible by 5 and 6? "+j);
            boolean k=(num%5==0 ^ num%6==0);
            System.out.println("Is "+num+" divisible by 5 and 6,but not both? "+k);
    }
 
}



这个是旁边的兄弟写的  简单许多

这个是仿照书上改的
for一年级小朋友的
[加法运算]
测验


/**
 * @author Gubowen
 *课本习题 P74  3.13
 **/
import javax.swing.JOptionPane;
public class test_02_for3_13 {
    public static void main(String [] args){
        int num1=(int)(Math.random()*10);
        int num2=(int)(Math.random()*10);
        String answerString=JOptionPane.showInputDialog(num1+" 加 "+num2+" 等于多少？");
        int answer=Integer.parseInt(answerString);
        String replyString;
        if(num1+num2==answer)
            replyString="你答对了！";
        else
            replyString="你答错了！\n"+num1+"+"+num2+"应该等于"+(num1+num2);
        JOptionPane.showMessageDialog(null,replyString);
    }
}

好，再接再厉

/**
 * @author Gubowen
 *课本习题 P97  4.11
 */
public class test_04_for4_11 {
    public static void main(String[] args){
        int i,j=0;
        for (i=100;i<=200;i++){
            if(i%5==0 ^ i%6==0){
                System.out.print(i+" ");
                j++;
                if(j==10){
                System.out.println();     
                j=0;
                }
            }
        }
    }
}


这个程序 太烦了 求更加简单的做法



输出的效果
【
100 102 105 108 110 114 115 125 126 130  
132 135 138 140 144 145 155 156 160 162  
165 168 170 174 175 185 186 190 192 195  
198 200

】

刚开始学 命名规范要遵守

public class test_04_for4_11

楼主是用面向过程的方式写JAVA，转换面向对象思想可能会更好些

刚开始怎么学的啊！~

光明就在前面！加油！

个人感觉吗，第一个程序应该是：

public class MyFirstProc
{
    public static void main(String [] argvs)
    {   
        new Try().WriteIt();
    }
}
public class Try
{
     public static void WriteIt()
    {
        System.out.println("Hello,world!");
    }
}