diff --git a/src/main/java/com/examplehub/basics/number/DoubleExample.java b/src/main/java/com/examplehub/basics/number/DoubleExample.java
new file mode 100644
index 00000000..0e57f841
--- /dev/null
+++ b/src/main/java/com/examplehub/basics/number/DoubleExample.java
@@ -0,0 +1,4 @@
+package com.examplehub.basics.number;
+
+public class DoubleExample {
+}
diff --git a/src/main/java/com/examplehub/basics/oop/ObjectExample.java b/src/main/java/com/examplehub/basics/oop/ObjectExample.java
new file mode 100644
index 00000000..ca654f7b
--- /dev/null
+++ b/src/main/java/com/examplehub/basics/oop/ObjectExample.java
@@ -0,0 +1,4 @@
+package com.examplehub.basics.oop;
+
+public class ObjectExample {
+}
diff --git a/src/main/java/com/examplehub/leetcode/middle/ValidSudoku.java b/src/main/java/com/examplehub/leetcode/middle/ValidSudoku.java
index 0df44edc..36f82b64 100644
--- a/src/main/java/com/examplehub/leetcode/middle/ValidSudoku.java
+++ b/src/main/java/com/examplehub/leetcode/middle/ValidSudoku.java
@@ -29,7 +29,6 @@ public static boolean solution1(char[][] board) {
return false;
}
}
-
// travel all sub-box
// TODO
return true;
diff --git a/src/test/java/com/examplehub/basics/bool/BooleanExampleTest.java b/src/test/java/com/examplehub/basics/bool/BooleanExampleTest.java
index fde37595..fd29f4da 100644
--- a/src/test/java/com/examplehub/basics/bool/BooleanExampleTest.java
+++ b/src/test/java/com/examplehub/basics/bool/BooleanExampleTest.java
@@ -48,4 +48,24 @@ void testTernaryOperator() {
int abs = num < 0 ? -num : num;
assertEquals(3, abs);
}
+
+ @Test
+ void testValueOf() {
+ Boolean b = Boolean.valueOf(true);
+ assertTrue(b.booleanValue());
+
+ b = Boolean.valueOf("false");
+ assertFalse(b.booleanValue());
+ }
+
+ @Test
+ void testAutoBoxing() {
+ Boolean b = false;
+ System.out.println(b);
+ assertFalse(b);
+
+ boolean bValue = b;
+ System.out.println(bValue);
+ assertFalse(bValue);
+ }
}
diff --git a/src/test/java/com/examplehub/basics/chars/CharExampleTest.java b/src/test/java/com/examplehub/basics/chars/CharExampleTest.java
index 7dcd997f..fc3e0a53 100644
--- a/src/test/java/com/examplehub/basics/chars/CharExampleTest.java
+++ b/src/test/java/com/examplehub/basics/chars/CharExampleTest.java
@@ -32,4 +32,63 @@ void testAddAndSub() {
assertEquals(9, '9' - '0');
assertEquals(0, 'a' - 97);
}
+
+ @Test
+ void testValueOf() {
+ Character c = Character.valueOf('A');
+ assertEquals('A', c.charValue());
+ }
+
+ @Test
+ void testAutoboxing() {
+ Character c = 'A';
+ System.out.println(c);
+ assertEquals('A', c);
+ }
+
+ @Test
+ void testIsLower() {
+ assertFalse(Character.isLowerCase('A'));
+ assertTrue(Character.isLowerCase('a'));
+ assertFalse(Character.isLowerCase('1'));
+ }
+
+ @Test
+ void testIsUpper() {
+ assertTrue(Character.isUpperCase('A'));
+ assertFalse(Character.isUpperCase('a'));
+ assertFalse(Character.isUpperCase('1'));
+ }
+
+ @Test
+ void testIsDigit() {
+ System.out.println(Character.isDigit('A'));
+ System.out.println(Character.isDigit('a'));
+ System.out.println(Character.isDigit('1'));
+
+ assertFalse(Character.isDigit('A'));
+ assertFalse(Character.isDigit('a'));
+ assertTrue(Character.isDigit('1'));
+ }
+
+ @Test
+ void testToLower() {
+ assertEquals('a', Character.toLowerCase('A'));
+ }
+
+ @Test
+ void testToUpper() {
+ assertEquals('A', Character.toUpperCase('a'));
+ }
+
+ @Test
+ void testGetNumericValue() {
+ System.out.println(Character.getNumericValue('8'));
+ assertEquals(8, Character.getNumericValue('8'));
+
+ System.out.println(Character.getNumericValue('A'));
+ System.out.println(Character.getNumericValue('a'));
+ assertEquals(10, Character.getNumericValue('A'));
+ assertEquals(10, Character.getNumericValue('a'));
+ }
}
diff --git a/src/test/java/com/examplehub/basics/number/DoubleExampleTest.java b/src/test/java/com/examplehub/basics/number/DoubleExampleTest.java
new file mode 100644
index 00000000..b6850551
--- /dev/null
+++ b/src/test/java/com/examplehub/basics/number/DoubleExampleTest.java
@@ -0,0 +1,32 @@
+package com.examplehub.basics.number;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class DoubleExampleTest {
+ @Test
+ void testValueOf() {
+ Double d = Double.valueOf(3.14);
+ System.out.println(d.doubleValue());
+ assertEquals(3.14, d.doubleValue());
+
+ d = Double.valueOf("3.14159");
+ System.out.println(d.doubleValue());
+ assertEquals(3.14159, d.doubleValue());
+ }
+
+ @Test
+ void testIsNaN() {
+ Double d = 0.0 / 0;
+ assertEquals(d, Double.NaN);
+ }
+
+ @Test
+ void testAutoboxing() {
+ Double d = 3.14;
+ assertEquals(3.14, d.doubleValue());
+ double pi = d;
+ assertEquals(3.14, pi);
+ }
+}
\ No newline at end of file
diff --git a/src/test/java/com/examplehub/basics/number/IntegerExampleTest.java b/src/test/java/com/examplehub/basics/number/IntegerExampleTest.java
index 6f315d42..aa059636 100644
--- a/src/test/java/com/examplehub/basics/number/IntegerExampleTest.java
+++ b/src/test/java/com/examplehub/basics/number/IntegerExampleTest.java
@@ -2,9 +2,39 @@
import static org.junit.jupiter.api.Assertions.*;
+import jdk.jfr.StackTrace;
import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.function.Executable;
class IntegerExampleTest {
+
+ @Test
+ void testValueOf() {
+ Integer integer = Integer.valueOf(100);
+ System.out.println(integer);
+ assertEquals(100, integer.intValue());
+
+ integer = Integer.valueOf("123");
+ System.out.println(integer);
+ assertEquals(123, integer.intValue());
+
+ integer = Integer.valueOf("a", 16);
+ System.out.println(integer);
+ assertEquals(10, integer.intValue());
+ }
+
+ @Test
+ void testParseInt() {
+ int number = Integer.parseInt("123");
+ System.out.println(number);
+ assertEquals(123, number);
+
+ assertThrows(NumberFormatException.class, () -> {
+ int num = Integer.parseInt("123a");
+ fail();
+ });
+ }
+
@Test
void testAutoBoxing() {
Integer integer = 10;
@@ -12,6 +42,11 @@ void testAutoBoxing() {
Integer integer1 = 10;
assertTrue(integer == integer1);
assertTrue(integer.equals(integer1));
+
+ Integer first = 128;
+ Integer second = 128;
+ System.out.println(first == second);
+ assertNotSame(first, second);
}
@Test
@@ -24,4 +59,19 @@ void testAutoBoxingNullPointer() {
assertTrue(true);
}
}
+
+ @Test
+ void testToBinaryString() {
+ assertEquals("1010", Integer.toBinaryString(10));
+ }
+
+ @Test
+ void testToOctalString() {
+ assertEquals("12", Integer.toOctalString(10));
+ }
+
+ @Test
+ void test(){
+ assertEquals("a", Integer.toHexString(10));
+ }
}
diff --git a/src/test/java/com/examplehub/basics/oop/ObjectExampleTest.java b/src/test/java/com/examplehub/basics/oop/ObjectExampleTest.java
new file mode 100644
index 00000000..75877b1a
--- /dev/null
+++ b/src/test/java/com/examplehub/basics/oop/ObjectExampleTest.java
@@ -0,0 +1,110 @@
+package com.examplehub.basics.oop;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Objects;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class ObjectExampleTest {
+ @Test
+ void testObject() {
+ Object o = new Object();
+ System.out.println(o);
+ }
+
+ @Test
+ void testEquals() {
+ class Student {
+ private int id;
+ private String name;
+ public Student(int id, String name) {
+ this.id = id;
+ this.name = name;
+ }
+ }
+ class People {
+ private final String name;
+ private final int age;
+
+ public People(String name, int age) {
+ this.name = name;
+ this.age = age;
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) return true;
+ if (o == null || getClass() != o.getClass()) return false;
+ People people = (People) o;
+ return age == people.age && Objects.equals(name, people.name);
+ }
+
+ @Override
+ public int hashCode() {
+ return 0;
+ }
+ }
+ Student stu1 = new Student(10001, "duyuanchao");
+ Student stu2 = new Student(10001, "duyuanchao");
+ assertNotSame(stu1, stu2);
+ assertNotEquals(stu1, stu2);
+
+ People p1 = new People("duyuanchao", 25);
+ People p2 = new People("duyuanchao", 25);
+ People p3 = new People("jack", 25);
+ assertNotSame(p1, p2);
+ assertEquals(p1, p2);
+ assertNotEquals(p1, p3);
+ }
+
+ @Test
+ void testHashCode() {
+ class People {
+ private final String name;
+ private final int age;
+
+ public People(String name, int age) {
+ this.name = name;
+ this.age = age;
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) return true;
+ if (o == null || getClass() != o.getClass()) return false;
+ People people = (People) o;
+ return age == people.age && Objects.equals(name, people.name);
+ }
+
+ @Override
+ public int hashCode() {
+ return this.age % 13;
+ }
+ }
+ People p1 = new People("duyuanchao", 25);
+ People p2 = new People("duyuanchao", 25);
+ assertEquals(p1.hashCode(), p2.hashCode());
+ }
+
+ @Test
+ void testToString() {
+ class People {
+ private final String name;
+ private final int age;
+
+ public People(String name, int age) {
+ this.name = name;
+ this.age = age;
+ }
+
+ @Override
+ public String toString() {
+ return "name = " + name + ", age = " + age;
+ }
+ }
+
+ People people = new People("duyuanchao", 25);
+ assertEquals("name = duyuanchao, age = 25", people.toString());
+ }
+}
\ No newline at end of file
diff --git a/src/test/java/com/examplehub/basics/utils/MathUtilsExampleTest.java b/src/test/java/com/examplehub/basics/utils/MathUtilsExampleTest.java
index 62e2331d..98bd09b8 100644
--- a/src/test/java/com/examplehub/basics/utils/MathUtilsExampleTest.java
+++ b/src/test/java/com/examplehub/basics/utils/MathUtilsExampleTest.java
@@ -51,4 +51,11 @@ void testRandom() {
double randomNumber = Math.random();
assertTrue(randomNumber >= 0 && randomNumber < 1);
}
+
+ @Test
+ void testRound() {
+ assertEquals(3, Math.round(3.14));
+ assertEquals(4, Math.round(3.78));
+ assertEquals(-3, Math.round(-3.14));
+ }
}
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