15章

上机一

public class mm1 {
public boolean show(String name,String pwd1,String pwd2){
	boolean j=false;

if(name.length()<3&&pwd1.length()<6){
	System.out.println("用户名长度不能小于3,密码长度不能小于6");
}else if(pwd1.equals(pwd2)){
	System.out.println("注册成功,请牢记用户和密码");
	j=true;
}else{
	System.out.println("再次输入密码错误");
	
}
return j;
}}

******************************

<pre class="java" name="code">import java.util.Scanner;
public class uu {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		mm1 k=new mm1();
		Scanner input=new Scanner(System.in);
		boolean w=false;
		do{
		System.out.println("请输入用户名");
		String name1=input.next();
		System.out.println("请输入密码");
		String mi=input.next();
		System.out.println("请再次输入密码");
		String mi1=input.next();
		w=k.show(name1, mi, mi1);
		}while(!w);
		
	}

}
上机二

<pre class="java" name="code">  import java.util.Scanner;
public class pp {
	public static void main(String[] args) {
		boolean wen=false;
		boolean you=false;
		Scanner input=new Scanner(System.in);
 
		System.out.println("请输入文件名");
		String wenname=input.next();
		System.out.println("请输入你的邮箱");
		String youname=input.next();
		int index=wenname.lastIndexOf(".");
		if(index!=-1&&index!=0&&wenname.substring(index+1,wenname.length()).equals("java")){
			
			
				wen=true;
			}else{
				System.out.println("文件名无效");
			}
		if(youname.indexOf("@")!=-1&&youname.indexOf(".")>youname.indexOf("@")){
			you=true;
		}else{
			System.out.println("e.mail无效");
		}
			if(wen&&you){
				System.out.println("作业提交成功");
			}else{
				System.out.println("作业提交不成功");
			}
		}                                                                                                                                  
上机3		

public class bb {
public boolean show(String sheng,String shou,String zuo){
	boolean b=false;
	String[] splity=new String[3];
	splity
	=zuo.split("-");
	if(sheng.length()!=16){
		System.out.println("身份证号必须是16位");
		
	}
	else if(shou.length()!=11){
		System.out.println("手机号必须是11位");
	}else if(splity[0].length()!=4&&splity[0].length()!=7){
		System.out.println("电话号必须是4位, 电话号才是7位");
	}else{
		System.out.println("注册成功");
		b=true;
	
	}
	return b;
}
}
*******************************
import java.util.Scanner;
public class bb1 {
public static void main(String[] args) {
	Scanner input=new Scanner(System.in);
	bb k=new bb();
	
	boolean w=false;
	do{
		System.out.println("请输入身份证号");
		String sheng=input.next();
		System.out.println("请输入手机号");
		String show=input.next();
		System.out.println("请输入座机号");
		String zuo=input.next();
		w=k.show(sheng, show, zuo);
		System.out.println(w);
	}while(!w);
}
}