import(life): Add java07.

6 files changed, 156 insertions, 2 deletions

diff --git a/works/life/java-practice/javatest/.classpath b/works/life/java-practice/javatest/.classpath
index 6bf1eac..9af0373 100644
--- a/works/life/java-practice/javatest/.classpath
+++ b/works/life/java-practice/javatest/.classpath
@@ -1,10 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>

 <classpath>

-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-15">

+	<classpathentry kind="src" path="src"/>

+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER">

 		<attributes>

 			<attribute name="module" value="true"/>

 		</attributes>

 	</classpathentry>

-	<classpathentry kind="src" path="src"/>

 	<classpathentry kind="output" path="bin"/>

 </classpath>

diff --git a/works/life/java-practice/javatest/src/javatest/e0701/Main.java b/works/life/java-practice/javatest/src/javatest/e0701/Main.java
new file mode 100644
index 0000000..0211750
--- /dev/null
+++ b/works/life/java-practice/javatest/src/javatest/e0701/Main.java
@@ -0,0 +1,25 @@
+package javatest.e0701;

+

+public class Main {

+	private static int countSubstring(String string, String substring) {

+		int count = 0;

+		int currentIndex = 0;

+

+		while (true) {

+			int i = string.indexOf(substring, currentIndex);

+			if (i == -1)

+				break;

+			count++;

+			currentIndex = i + 1;

+		}

+

+		return count;

+	}

+

+	public static void main(String[] args) {

+		String string = "ababaaba";

+		String substring = "aba";

+

+		System.out.println(substring + "在" + string + "中出现了" + countSubstring(string, substring) + "次！");

+	}

+}

diff --git a/works/life/java-practice/javatest/src/javatest/e0702/Main.java b/works/life/java-practice/javatest/src/javatest/e0702/Main.java
new file mode 100644
index 0000000..15ececc
--- /dev/null
+++ b/works/life/java-practice/javatest/src/javatest/e0702/Main.java
@@ -0,0 +1,15 @@
+package javatest.e0702;

+

+import java.util.*;

+import java.time.*;

+import java.time.format.DateTimeFormatter;

+

+public class Main {

+	public static void main(String[] args) {

+		try (Scanner scanner = new Scanner(System.in)) {

+			LocalDateTime birthday = LocalDate.parse(scanner.nextLine(), DateTimeFormatter.ISO_DATE).atStartOfDay();

+			LocalDateTime now = LocalDate.now().atStartOfDay();

+			System.out.println("你的生日距今天" + Duration.between(birthday, now).toDays() + "天！");

+		}

+	}

+}

diff --git a/works/life/java-practice/javatest/src/javatest/p0701/StringExample.java b/works/life/java-practice/javatest/src/javatest/p0701/StringExample.java
new file mode 100644
index 0000000..be2c7b9
--- /dev/null
+++ b/works/life/java-practice/javatest/src/javatest/p0701/StringExample.java
@@ -0,0 +1,45 @@
+package javatest.p0701;

+

+public class StringExample {

+	public static void main(String args[]) {

+		String s1 = new String("you are a student"), s2 = new String("how are you");

+		if (s1.equals(s2)) // 使用equals方法判断s1与s2是否相同

+		{

+			System.out.println("s1与s2相同");

+		} else {

+			System.out.println("s1与s2不相同");

+		}

+		String s3 = new String("22030219851022024");

+		if (s3.startsWith("220302")) // 判断s3的前缀是否是“220302”。

+		{

+			System.out.println("吉林省的身份证");

+		}

+		String s4 = new String("你"), s5 = new String("我");

+		if (s4.compareTo(s5) > 0)// 按着字典序s4大于s5的表达式。

+		{

+			System.out.println("按字典序s4大于s5");

+		} else {

+			System.out.println("按字典序s4小于s5");

+		}

+		int position = 0;

+		String path = "c:\\java\\jsp\\A.java";

+		position = path.lastIndexOf('\\'); // 获取path中最后出现目录分隔符号的位置

+		System.out.println("c:\\java\\jsp\\A.java中最后出现\\的位置:" + position);

+		String fileName = path.substring(12, 18); // 获取path中“A.java”子字符串。

+		System.out.println("c:\\java\\jsp\\A.java中含有的文件名:" + fileName);

+		String s6 = new String("100"), s7 = new String("123.678");

+		int n1 = Integer.parseInt(s6); // 将s6转化成int型数据。

+		double n2 = Double.parseDouble(s7); // 将s7转化成double型数据。

+		double m = n1 + n2;

+		System.out.println(m);

+		String s8 = String.valueOf(m); // String调用valuOf(int n)方法将m转化为字符串对象

+		position = s8.indexOf(".");

+		String temp = s8.substring(position + 1);

+		System.out.println("数字" + m + "有" + temp.length() + "位小数");

+		String s9 = new String("ABCDEF");

+		char a[] = s8.toCharArray(); // 将s8存放到数组a中。

+		for (int i = a.length - 1; i >= 0; i--) {

+			System.out.print(" " + a[i]);

+		}

+	}

+}

diff --git a/works/life/java-practice/javatest/src/javatest/p0702/DateExample.java b/works/life/java-practice/javatest/src/javatest/p0702/DateExample.java
new file mode 100644
index 0000000..74e4901
--- /dev/null
+++ b/works/life/java-practice/javatest/src/javatest/p0702/DateExample.java
@@ -0,0 +1,40 @@
+package javatest.p0702;

+

+import java.util.*;

+import java.time.*;

+

+import javax.swing.JOptionPane;

+

+public class DateExample {

+	public static void main(String args[]) {

+		String str = JOptionPane.showInputDialog("输入第一个日期的年份:");

+		int yearOne = Integer.parseInt(str);

+		str = JOptionPane.showInputDialog("输入该年的月份:");

+		int monthOne = Integer.parseInt(str);

+		str = JOptionPane.showInputDialog("输入该月份的日期:");

+		int dayOne = Integer.parseInt(str);

+		str = JOptionPane.showInputDialog("输入第二个日期的年份:");

+		int yearTwo = Integer.parseInt(str);

+		str = JOptionPane.showInputDialog("输入该年的月份:");

+		int monthTwo = Integer.parseInt(str);

+		str = JOptionPane.showInputDialog("输入该月份的日期:");

+		int dayTwo = Integer.parseInt(str);

+		Calendar calendar = Calendar.getInstance(); // 初始化日历对象

+		calendar.set(yearOne, monthOne, dayOne); // 将calendar的时间设置为yearOne年monthOne月dayOne日

+		long timeOne = calendar.getTimeInMillis(); // calendar表示的时间转换成毫秒

+		calendar.set(yearTwo, monthTwo, dayTwo); // 将calendar的时间设置为yearTwo年monthTwo月dayTwo日

+		long timeTwo = calendar.getTimeInMillis(); // calendar表示的时间转换成毫秒。

+		Date date1 = new Date(timeOne); // 用timeOne做参数构造date1

+		Date date2 = new Date(timeTwo); // 用timeTwo做参数构造date2

+		if (date2.equals(date1)) {

+			System.out.println("两个日期的年、月、日完全相同");

+		} else if (date2.after(date1)) {

+			System.out.println("您输入的第二个日期大于第一个日期");

+		} else if (date2.before(date1)) {

+			System.out.println("您输入的第二个日期小于第一个日期");

+		}

+		long days = Duration.between(date1.toInstant(), date2.toInstant()).toDays();// 计算两个日期相隔天数

+		System.out.println(yearOne + "年" + monthOne + "月" + dayOne + "日和" + yearTwo + "年" + monthTwo + "月" + dayTwo

+				+ "相隔" + days + "天");

+	}

+}

diff --git a/works/life/java-practice/javatest/src/javatest/p0703/BigIntegerExample.java b/works/life/java-practice/javatest/src/javatest/p0703/BigIntegerExample.java
new file mode 100644
index 0000000..05b2e38
--- /dev/null
+++ b/works/life/java-practice/javatest/src/javatest/p0703/BigIntegerExample.java
@@ -0,0 +1,29 @@
+package javatest.p0703;

+

+import java.math.*;

+

+class BigIntegerExample {

+	public static void main(String args[]) {

+		BigInteger n1 = new BigInteger("987654321987654321987654321"),

+				n2 = new BigInteger("123456789123456789123456789"), result = null;

+		result = n1.add(n2); // n1和n2做加法运算

+		System.out.println("和:" + result.toString());

+		result = n1.subtract(n2);// n1和n2做减法运算

+		System.out.println("差:" + result.toString());

+		result = n1.multiply(n2);// n1和n2做乘法运算

+		System.out.println("积:" + result.toString());

+		result = n1.divide(n2);// n1和n2做除法运算

+		System.out.println("商:" + result.toString());

+		BigInteger m = new BigInteger("1968957"), COUNT = new BigInteger("0"), ONE = new BigInteger("1"),

+				TWO = new BigInteger("2");

+		System.out.println(m.toString() + "的因子有:");

+		for (BigInteger i = TWO; i.compareTo(m) < 0; i = i.add(ONE)) {

+			if ((n1.remainder(i).compareTo(BigInteger.ZERO)) == 0) {

+				COUNT = COUNT.add(ONE);

+				System.out.print("  " + i.toString());

+			}

+		}

+		System.out.println("");

+		System.out.println(m.toString() + "一共有" + COUNT.toString() + "个因子");

+	}

+}