start

Author: JavaProgrammerLB

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <packaging>jar</packaging>
+
+    <groupId>org.example</groupId>
+    <artifactId>pythonchallenge</artifactId>
+    <version>1.0.0</version>
+
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.13</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+</project>

src/main/java/com/yitianyigexiangfa/pythonchallenge/Level1.java

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+package com.yitianyigexiangfa.pythonchallenge;
+
+import java.text.NumberFormat;
+
+public class Level1 {
+
+    public static void main(String[] args) {
+        Double result = Math.pow(2, 38);
+        System.out.println(result);
+        NumberFormat numberFormat = NumberFormat.getInstance();
+        numberFormat.setGroupingUsed(false);
+        String resultVal = numberFormat.format(result);
+        System.out.println(resultVal);
+    }
+
+
+}

src/main/java/com/yitianyigexiangfa/pythonchallenge/Level2.java

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+package com.yitianyigexiangfa.pythonchallenge;
+
+public class Level2 {
+
+    public static void main(String[] args) {
+        char[] chars = str.toCharArray();
+        for (char charElment: chars) {
+//             char newChar = charElment + 2;
+            System.out.print(Character.toString(charElment));
+            System.out.println();
+            int value = Character.getNumericValue(charElment);
+            System.out.print(value);
+        }
+    }
+
+
+
+    private static String str = "g fmnc wms bgblr rpylqjyrc gr zw fylb. rfyrq ufyr amknsrcpq " +
+            "ypc dmp. bmgle gr gl zw fylb gq glcddgagclr ylb rfyr'q ufw rfgq rcvr gq qm jmle. " +
+            "sqgle qrpgle.kyicrpylq() gq pcamkkclbcb. lmu ynnjw ml rfc spj.";
+}

src/main/java/com/yitianyigexiangfa/pythonchallenge/package-info.java

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+package com.yitianyigexiangfa.pythonchallenge;

src/test/java/com/yitianyigexiangfa/pythonchallenge/Level1Test.java

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+package com.yitianyigexiangfa.pythonchallenge;
+
+import org.junit.Test;
+
+import java.text.NumberFormat;
+
+import static org.junit.Assert.*;
+
+public class Level1Test {
+
+    @Test
+    public void pow(){
+        Double result = Math.pow(2, 3);
+        assertEquals(new Double(8), result);
+    }
+
+    @Test
+    public void numberFormatTest(){
+        Double d = 123456789123D;
+        System.out.println(d);
+        NumberFormat numberFormat = NumberFormat.getInstance();
+        String dStr = numberFormat.format(d);
+        assertEquals("123,456,789,123", dStr);
+        numberFormat.setGroupingUsed(false);
+        String dStr2 = numberFormat.format(d);
+        assertEquals("123456789123", dStr2);
+    }
+
+    @Test
+    public void doubleToString(){
+        Double d = Math.pow(2, 38);
+        System.out.println(d);
+        NumberFormat numberFormat = NumberFormat.getInstance();
+        numberFormat.setGroupingUsed(false);
+        String numStr = numberFormat.format(d);
+        System.out.println(numStr);
+        assertEquals("2.74877906944E11", d.toString());
+    }
+}

src/test/java/com/yitianyigexiangfa/pythonchallenge/Level2Test.java

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+package com.yitianyigexiangfa.pythonchallenge;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class Level2Test {
+
+    @Test
+    public void charToInteger() {
+        byte[] bytes = "a".getBytes();
+        int digit = bytes[0];
+        assertEquals(digit, 97);
+        System.out.println(digit);
+    }
+}