m0_46398042的博客

案例 方法 数组遍历public class shuzubianli { public static void main(String[] args) { //定义一个数组,用静态初始化完成数组元素初始化 int arr[]={11,22,33,44,55}; //调用方法 cunchu1(arr); } //定义一个方法,用数组遍历通用格式对数组进行遍历 /* 两个明确: 返回值

方法参数传递引用类型public class fangfa_fangfacanshuchuandiyinyongleixing { public static void main(String[] args) { int []arr={10,20,30}; System.out.println("调用cunchu1方法前"+arr[1]); //对于引用类型的参数,形式参数的改变,影响实际参数的值 cunchu1(arr);

方法参数传递基本类型public class fangfa_fangfadecanshuchuandi { public static void main(String[] args) { int number=100; System.out.println("调用cunchu1方法前:"+number); //对于基本数据类型的参数,形式参数的改变,不影响实际参数的值 cunchu1(number); System.out.p

方法重载//多个方法在同一个类中//多个方法具有相同的方法名//多个方法的参数不同,类型不同或者数量不同public class fangfa_fangfachongzai { public static void main(String[] args) { int cunchu1=sum(10,20); //调用方法 System.out.println(cunchu1); //输出 double cunchu2=sum(1

方法的通用格式public class fangfa_fangfadetongyongheshi { public static void main(String[] args) { /* * * 格式: public static 返回值类型 方法名(参数){ * 方法体; * return数据; * } * * public static

方法的注意事项public class fangfa_zhuyishixiang { public static void main(String[] args) { } /*public static void fangfa(){ public static void fangfa(){ //方法不能嵌套 } }*/ public static void fangfa(){// retur

带返回值方法的定义和调用练习public class fangfa_daifanhuizhifangfadedingyihediaoyonglianxi { public static void main(String[] args) { int gg=getMax(10,20); //调用 推荐使用 System.out.println(gg); //输出 // System.out.println(getMax(10,20));

带参数方法的定义和调用public class fangfa_daicanshufangfadedingyihediaoyong { public static void main(String[] args) { daicanshi(10);//常量的调用 int number = 10; // 10 实参 daicanshi(number);//变量的调用

方法的定义和调用public class fangfa_dingyihediaoyong { public static void main(String[] args) { fangfa(); //调用方法 } public static void fangfa() { //定义一个方法 int number = 10; //定义变量 if (number % 2 == 0) { //判断number是否是偶数

数组 遍历public class shuzu_bianli { public static void main(String[] args) { //定义数组 int[] arr = {11, 22, 33, 44, 55}; //使用通用遍历格式 for (int x = 0; x < arr.length; x++) { System.out.println(arr[x]);

数组静态初始化public class shuzu_jingtaichushihua { public static void main(String[] args) { //定义数组 int[] arr = {1, 2, 3}; //输出数组名 System.out.println(arr); //输出数组中的元素 System.out.println(arr[0]); Syst

数组动态初始化public class shuzu_dongtaichushihua { public static void main(String[] args) { int[]are;//数组的定义格式 int[] arr = new int[3];//数组动态初始化 /* 左边: int:说明数组中的元素类型是int类型 []:说明这是一个数组 arr: 这

Randomimport java.util.Random;public class RandomDomo { public static void main(String[] args) { Random r = new Random();//创建对象 for (int i = 0; i < 10; i++) { //用循环获取10个随机数 int number = r.nextInt(10); /

循环嵌套public class xunhuanqiantao { public static void main(String[] args) { for (int xiaoshi = 0; xiaoshi < 24; xiaoshi++) { for (int fenzhong = 0; fenzhong < 60; fenzhong++) { System.out.println(xiaoshi+"时"+f

跳转控制语句 continue breakpublic class tiaozhuankongzhiyuju { public static void main(String[] args) { for (int i = 1; i <=5 ; i++) { if (i%2==0){ continue;//用在循环中,基于条件控制,跳过某次循环体内容的执行,继续下一次的执行 //br

三种循环结构 for while do…whilepublic class sanzhongxunhuandejubie { public static void main(String[] args) { for (int i = 1; i <= 5; i++) { System.out.println("我爱JAVA"); } System.out.println("--------");

do…while结构public class do_while { public static void main(String[] args) { int j=1; do { System.out.println("HelloWorld"); j++; }while (j<=5); }}

while循环结构public class while_ { public static void main(String[] args) { int j = 1; while (j <= 5) { System.out.println("HelloWorld"); j++; } }}

for循环结构public class for_xunhuanyuju { public static void main(String[] args) { for (int i = 1; i <=5 ; i++) { System.out.println("HelloWorld"); } }}

switch结构import java.util.Scanner;public class switch_ { public static void main(String[] args) { System.out.println("开始"); Scanner sc = new Scanner(System.in); int week = sc.nextInt(); switch (week) {

//if…else…if…else结构import java.util.Scanner;//导包public class if___else___if { public static void main(String[] args) { System.out.println("开始"); Scanner sc = new Scanner(Syste...

if…else结构public class if_____else { public static void main(String[] args) { System.out.println("开始"); int a = 10; int b = 20; b=5; if (a > b) { ...

if结构public class ifjiegou { public static void main(String[] args) { System.out.println("开始"); int a=10; int b=20; if(a==b){ System.out.println("a等于b")...

顺序结构public class shunxujiegou { public static void main(String[] args) { //流程控制语句分类: //顺序结构 分支结构(if switch) //循环结构(for while do......while ) }}...

数据输入import java.util.Scanner;//导包//Sc自动生成public class shujushuru { public static void main(String[] args) { Scanner sc =new Scanner (System.in);//创建对象 int x=sc.nextInt();//接收数据...

三元运算符public class sanyuanyunsuanfu { public static void main(String[] args) { int a = 10; int b = 20; // true运行a(表达式1) false运行b(表达式2) max为最大值 int max = (a &...

断路逻辑运算符public class duanluluojiyunsuanfu { public static void main(String[] args) { int i = 10; int j = 20; int k = 30; //&&有false则false System.ou...

逻辑运算符public class luojiyunsuanfu { public static void main(String[] args) { int i = 10; int j = 20; int k = 30; //&有false则false 逻辑与 a&b,a和b都是true,结果为t...

关系运算符public class guanxiyunsuanfu { public static void main(String[] args) { int i=10; int j=20; int k=10; //==判断是否相等 System.out.println(i==j); S...

自增自减运算符public class zizengzijianyunsuanfu { public static void main(String[] args) { int a=10; System.out.println("a:"+a); int b=++a; System.out.println("b:"+b);/...

赋值运算符public class fuzhiyunsuanfu { public static void main(String[] args) { int i=10; System.out.println("i:"+i);//定义i=10 i+=20; System.out.println("i:"+i);//i+20后...

字符串的+操作public class zifuchuandejiacaozuo { public static void main(String[] args) { System.out.println("it"+"heima");//itheima System.out.println("itheima"+666);//itheima666 ...

字符的＋操作public class zifudejiacaozuo { public static void main(String[] args) { int i = 10; char c = 'A';//A计算机底层数值65 c = 'a';//a计算机底层数值97 c = '0';//0计算机底层数值48 ...

算术运算符public class suanshuyunsuanfu { public static void main(String[] args) { int a=6; int b=4; System.out.println(a+b); System.out.println(a-b); System.ou...

类型转换public class leixingzhuanhuan { public static void main(String[] args) { double d=10; System.out.println(d); byte b=10; short s=b; int i=b; i...

-变量使用的注意事项public class bianliang_ll { public static void main(String[] args) { byte b=10; System.out.println(b); short s=100; System.out.println(s); int ...

-变量public class bianliang { public static void main(String[] args) { //定义变量 int a = 10; //输出变量 System.out.println(a); //更改变量 a = 20; Syste...

标题-常量public class changliang { public static void main(String[] args) { //字符串常量 System.out.println("HelloWorld"); System.out.println("程序员"); System.out.println("--...

标题 - Hello Worldpublic class HelloWorld { public static void main(String[] args) { System.out.println("HelloWorld"); }}