课程 \
Java入门第一季（IDEA工具）升级版
1-4 第一个Java程序
public class HelloWorld {
public static void main(String[] args){
System.out.println("hello imooc");
}
}
2021-09-09
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2-1 Java中的关键字
public class HelloWorld {
public static void main(String[] args){
System.out.println("hello imooc");
}
}
2021-09-09
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2-2 认识Java标识符
public class HelloWorld{
public static void main(String[] args) {
System.out.println("hello imooc");
}
}
2021-09-09
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2-5 如何命名Java变量
public class HelloWorld{
public static void main(String[] args) {
String a = "我爱慕课网";
String b = "www.imooc.com";
System.out.println(a);
System.out.println(b);
}
}
2022-05-06
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2-6 Java中的数据类型
public class HelloWorld{
public static void main(String[] args) {
String name="爱慕课";
char sex='男';
int num=18;
double price=120.5;
boolean isOK=true;
System.out.println(name);
System.out.println(sex);
System.out.println(num);
System.out.println(price);
System.out.println(isOK);
}
}
2022-05-06
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2-7 Java中变量的使用规则
public class HelloWorld{
public static void main(String[] args) {
String city = "beijing";
System.out.println("我的家乡在："+city);
}
}
2022-05-06
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2-9 Java中的自动类型转换
public class HelloWorld{
public static void main(String[] args) {
double avg1=78.5;
int rise=5;
double avg2=avg1+rise;
System.out.println("考试平均分："+avg1);
System.out.println("调整后的平均分："+avg2);
}
}
2022-05-06
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2-10 Java中的强制类型转换
public class HelloWorld{
public static void main(String[] args) {
double heightAvg1=176.2;
int heightAvg2=(int)heightAvg1;
System.out.println(heightAvg1);
System.out.println(heightAvg2);
}
}
2022-05-06
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2-11 Java常量的应用
public class HelloWorld{
public static void main(String[] args) {
final char MALE = '男';
final char FEMALE = '女';
System.out.println(MALE);
System.out.println(FEMALE);
}
}
2022-05-06
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2-12 如何在Java中使用注释
public class HelloWorld{
public static void main(String[] args) {
// System.out.println("Java");
System.out.println("imooc");
/** System.out.println("Oracle");
System.out.println("MySQL");*/
}
}
2022-05-06
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3-1 什么是运算符
public class HelloWorld{
public static void main(String[] args) {
int a=12;
int b=24;
int sum = a+b;
System.out.println("两数之和为："+sum);
}
}
2022-05-06
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3-2 Java中的算术运算符
public class HelloWorld{
public static void main(String[] args) {
int age1=24;
int age2=18;
int age3=36;
int age4=27;
int sum=age1+age2+age3+age4;
double avg=(int )sum/4;
int temp = age1-age2;
int newAge=--age1;
System.out.println("年龄总和："+sum);
System.out.println("平均年龄："+avg);
System.out.println("年龄差值："+temp);
System.out.println("自减后的年龄："+newAge);
}
}
2022-07-20
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3-3 Java中的赋值运算符
public class HelloWorld{
public static void main(String[] args) {
int one = 10 ;
int two = 20 ;
int three = 0 ;
three = one + two;
System.out.println("three = one + two ==>" + three);
three = three += one;
System.out.println("three += one ==>" + three);
three = three -= one;
System.out.println("three -= one ==>" + three);
three = three *= one;
System.out.println("three *= one ==>" + three);
three = three /= one;
System.out.println("three /= one ==>" + three);
three = three %= one;
System.out.println("three %= one ==>" + three);
}
}
2022-05-06
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3-4 Java中的比较运算符
public class HelloWorld{
public static void main(String[] args) {
int a=16;
double b=9.5;
String str1="hello";
String str2="imooc";
System.out.println("a等于b：" + (a == b));
System.out.println("a大于b：" + (a > b));
System.out.println("a小于等于b：" + (a <= b));
System.out.println("str1等于str2：" + (str1 == str2));
}
}
2022-05-06
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3-5 Java中的逻辑运算符
public class HelloWorld {
public static void main(String[] args) {
boolean a = true; // a同意
boolean b = false; // b反对
boolean c = false; // c反对
boolean d = true; // d同意
System.out.println((a&&b)+"未通过");
System.out.println((a||d)+"通过");
System.out.println(!a+"未通过");
System.out.println((c^d)+"通过");
}
}
2022-05-07
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3-7 Java中的条件运算符
public class HelloWorld{
public static void main(String[] args) {
int score=68;
String mark = score >= 60 ? "及格" : "不及格";
System.out.println("考试成绩如何："+mark);
}
}
2022-05-07
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3-8 Java中运算符的优先级
public class HelloWorld {
public static void main(String[] args) {
int m = 5;
int n = 7;
int x = (m*8/(n+2))%m;
System.out.println("m:" + m);
System.out.println("n:" + n);
System.out.println("x:" + x);
}
}
2022-05-07
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4-1 Java条件语句之 if
public class HelloWorld {
public static void main(String[] args) {
int one = 20 ;
if(one%2==0){
System.out.println("one是偶数");
}
}
}
2022-05-07
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4-2 Java条件语句之 if...else
public class HelloWorld {
public static void main(String[] args) {
int age=25;
if(age>18){
System.out.println("成年");
}else{
System.out.println("未成年");
}
}
}
2022-05-07
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