diff options
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");
+ }
+}
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