第七次课的总结与思考

package objectoriented;

public class Dog {

	public String name;
	public void run(){
		System.out.print(name + " is running...");
		//this指向当前对象
		this.jump();
	}
	public void jump(){
		System.out.print(" jump");
	}
}

package objectoriented;

public class ObjectOriented {

	public static void main(String[] args) {

		Dog dog = new Dog();
		dog.name = "little dog";
		dog.run();
	}

}

little dog is running... jump

那么为什么在Dog类中，方法与方法之间可以相互调用？
因为在run方法中，this.jump()有this指针，而this指向当前对象。（在run方法中，this.jump()的this也可以不写）

package objectoriented;

public class TestArgsPass {

	public static void main(String[] args) {

		int a = 100;
		int b = 102;
		System.out.println("交换前：a = "
				+ a + " b = " + b);
		swap(a,b);
		System.out.println("交换结束后：a = "
				+ a + " b = " + b);
	}

	public static void swap(int a, int b) {

		int temp = a;
		a = b;
		b = temp;
		System.out.println("swap方法里面的值：a = "
				+ a + " b = " + b);
	}
	
}

交换前：a = 100 b = 102
swap方法里面的值：a = 102 b = 100
交换结束后：a = 100 b = 102

                3、可变参数类型，如String...args

package objectoriented;

public class Party {
	
	public static void main(String[] args) {
		Party party = new Party();
		party.info("小明","小强","小亮");
	}

public void info(String... args) {
	System.out.println("人数 = " + args.length+"人");
	System.out.print("具体有：");
	for (String i : args) {
		System.out.print(i + "， ");
	}
}

}

人数 = 3人
具体有：小明， 小强， 小亮， 

package objectoriented;

public class Party {
	public static void main(String[] args) {
		Party party = new Party();
		party.info(2007,"小明","小强","小亮");
	}

public void info(int n,String...args) {
	System.out.println("第" + n+"届同学聚会");
	System.out.print("参加的人有：");
	for (String i : args) {
		System.out.print(i + ", ");
	}
}

}

第2007届同学聚会
参加的人有：小明, 小强, 小亮, 

package homework;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.swing.JOptionPane;

public class Person {

	private String name;
	private int age;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

}

package homework;

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTextField;

/**
 * 在GUI中，输入的姓名、年龄（规定：姓名只能由6-8位大小写的英文字母或汉字组成，年龄需<span style="font-family: Arial, Helvetica, sans-serif;">在40-50范围内），</span>如果姓名和年龄的输入格式正确，
 * 则显示结果；否则提醒用户相应的错误
 * 
 * @author jscly
 * @version 1.0
 * @dateTime 2016/06/05
 *
 */
public class MiddleAge extends JFrame {

	JLabel jl_name;
	JLabel jl_age;
	JTextField jtf_name;
	JTextField jtf_age;
	JButton jbt_sure;
	JButton jbt_reset;
	JButton jbt_cancel;
	JTextArea jta_result;

	public MiddleAge() {
		jl_name = new JLabel("姓名");
		jl_age = new JLabel("年龄");
		jtf_name = new JTextField();
		jtf_age = new JTextField();
		jbt_sure = new JButton("确定");
		jbt_reset = new JButton("重置");
		jbt_cancel = new JButton("取消");
		jta_result = new JTextArea();

		jl_name.setHorizontalAlignment(0);
		jl_age.setHorizontalAlignment(0);
		jta_result.setEditable(false);

		JPanel p1 = new JPanel();
		p1.setLayout(new GridLayout(2, 2, 5, 5));
		p1.add(jl_name);
		p1.add(jtf_name);
		p1.add(jl_age);
		p1.add(jtf_age);

		JPanel p2 = new JPanel();
		p2.setLayout(new GridLayout(2, 3, 5, 5));
		for (int i = 0; i < 3; i++) {
			p2.add(new JLabel());
		}
		p2.add(jbt_sure);
		p2.add(jbt_reset);
		p2.add(jbt_cancel);

		JPanel p3 = new JPanel();
		p3.setLayout(new GridLayout(2, 1, 5, 5));
		p3.add(p1);
		p3.add(p2);

		add(p3, BorderLayout.NORTH);
		add(jta_result, BorderLayout.CENTER);
		jbt_sure.addActionListener(new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {
				handle(jtf_name.getText(), jtf_age.getText());
			}

		});
		jbt_reset.addActionListener(new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {
				jtf_name.setText("");
				jtf_age.setText("");
			}
		});
		jbt_cancel.addActionListener(new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {
				System.exit(0);
			}
		});
	}

	public void handle(String name, String age) {
		Person person = new Person();
		int ageInt = 0;
		// 先判断姓名和年龄是否为空
		if ("".equals(name)) {
			JOptionPane.showMessageDialog(null, "姓名不能为空！");
			if ("".equals(age)) {
				JOptionPane.showMessageDialog(null, "年龄不能为空！");
			}
			return;
		}
		// （1）得到姓名的长度，接着判断这个长度是否合法
		// （2）判断年龄是否在[40,50]范围内
		if (!"".equals(name) || name != null
				&& (age != null || !"".equals(age))) {
			// 得到姓名的长度,并验证其有效性
			char[] charArray = name.toCharArray();
			int lengthOfName = 0;
			for (char i = 0; i < charArray.length; i++) {
				// 验证姓名的单个字符是否为大写或小写的英文字母，是则长度加1
				if ((charArray[i] >= 65 && charArray[i] <= 90)
						|| (charArray[i] >= 97 && charArray[i] <= 122)) {
					lengthOfName++;
				}
				
				/*
				 * 在unicode 编码表中 汉字范围从 4E00(一) 到 9fa5(龥); 
				 * int 范围是 19968 - 40869;
				 * 总共记录汉字数量为20902 个
				 */
				
				// 验证姓名的单个字符是否为汉字，是则长度加2
				else if (charArray[i] >= '\u4e00' && charArray[i] <= '\u9fa5') {
					lengthOfName += 2;
				}
				// 姓名的单个字符不合法
				else {
					lengthOfName = 0;
					break;
				}
			}

			// 判断姓名长度是否合法
			if (lengthOfName < 6 || lengthOfName > 8) {
				JOptionPane.showMessageDialog(null,
						"姓名格式错误！应由中、英文组成，范围为6-8位（1个汉字占2位）");
				return;
			}

			// 判断年龄格式是否合法，得到年龄
			Pattern pattern = Pattern.compile("\\d{2}");
			Matcher matcher = pattern.matcher(age);
			if (matcher.matches()) {
				ageInt = Integer.parseInt(age);
			} else {
				JOptionPane.showMessageDialog(null, "年龄格式错误！请输入[40,50]范围内的数字");
				return;
			}

			// 判断年龄是否在[40,50]范围内
			if ((ageInt < 40 || ageInt > 50)) {
				JOptionPane.showMessageDialog(null, "年龄格式错误！请输入[40,50]范围内的数字");
				return;
			}
		}
		person.setName(name);
		person.setAge(ageInt);

		jta_result
				.setText("姓名：" + person.getName() + "\n年龄：" + person.getAge());
	}

	public static void main(String[] args) {
		MiddleAge person = new MiddleAge();
		person.setVisible(true);
		person.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		person.setTitle("中年类");
		person.setLocationRelativeTo(null);
		person.setSize(400, 400);
	}
}

package printallchinese;

public class PrintAllChinese {

	/**
	 * 打印所有的汉字
	 * 
	 * 在unicode 编码表中 汉字范围从 4E00(一) 到 9fa5(龥)； int 范围是 19968 - 40869； 总共记录汉字数量
	 * 20902 个
	 * 
	 * @author jscly
	 * @version 1.0
	 * @dateTime 2016/06/04
	 * @return
	 */
	public String printAllChinses() {
		String result = "";
		// 法一
		// for (char i = '\u4e00',k = 0; i <= '\u9fa5'; i++,k++) {
		// if ((k + 1) % 50 == 0) {
		// result += "\n" + i;
		// k = 0;
		// }
		// else {
		// result += " " + i;
		// }
		// }

		// 法二
		for (int i = 19968, k = 0; i <= 40869; i++, k++) {
			// 每行输出50个汉字
			if ((k + 1) % 50 == 0) {
				result += "\n" + (char) i;
				k = 0;
			} else {
				result += " " + (char) i;
			}
		}

		return result;
	}

	public static void main(String[] args) {

		PrintAllChinese pac = new PrintAllChinese();
		String result = pac.printAllChinses();
		System.out.println(result);

	}

}