public class Continue {
public static void main(String[] args) {
for (int a = 1; a <= 100; a++) {
if (a == 4) {
continue;
}
if (a == 7) {
continue;
}
if (a % 10 == 4) {
continue;
}
if (a % 10 == 7) {
continue;
}
if (a % 4 == 10) {
continue;
}
if (a % 7 == 10) {
continue;
}
System.out.println(a + "楼到了!");
}
}
}
2，DoWhile
打印0-100
public class DoWhile {
public static void main(String[] args) {
int sum = 0;
do { //执行语句
System.out.println(sum);
sum += 1; //不加则是死循环 一直打印0
}
while (sum <= 100);//条件表达式
}
}
3，For
public class For {
public static void main(String[] args) {
int sum = 0;
for (int a = 0; a <= 100; a++) {
if (a % 2 == 0) {
sum += a;
}
}
System.out.println("1-100偶数和为：" + sum);
System.out.println("======================");
for (int i = 0; i < 5; i++) { //外层控制行
for (int j = 0; j < 6; j++) { //内层控制列
System.out.print(i + "t");
}
System.out.println();
}
System.out.println("======================");
for (int b = 1; b <= 9; b++) {
for (int c = 1; c <= b; c++) {
System.out.print(c + "x" + b + "=" + (c * b) + "t");
}
System.out.println();
}
System.out.println("======================");
for (int d = 9; d >= 1; d--) {
for (int e = 1; e <= d; e++) {
System.out.print(e + "x" + d + "=" + (d * e) + "t");
}
System.out.println();
}
System.out.println("======================");
for (int f = 1; f <= 5; f++) {
for (int g = 1; g <= 5; g++) {
System.out.print("*t");
}
System.out.println();
}
System.out.println("======================");
for (int h = 1; h <= 5; h++) {
for (int j = 1; j <= 5; j++) {
if ((h + j) % 2 == 0) {
System.out.print("*t");
} else if ((h + j) % 2 == 1) {
System.out.print("#t");
}
}
System.out.println();
}
System.out.println("======================");
int k = 0;
for (int l = 100; l <= 150; l++) {
if (l % 3 != 0) {
k++;
System.out.print(l + "、t");
}
if (k % 5 == 0) {
System.out.println();
}
}
System.out.print("n共打印：" + k + "次！！！");
System.out.println("======================");
//打印100-150之间的素数质数(带标签的continue)
outer:
for (int m = 101; m < 150; m++) {
for (int n = 2; n < m / 2; n++) {
if (m % n == 0) {
continue outer;//从内部直接跳转到外部
}
}
System.out.println(m);
}
}
}
打印结果：
1-100偶数和为：2550 ====================== 0 0 0 0 0 0 1 1 1 1 1 1 2 2 2 2 2 2 3 3 3 3 3 3 4 4 4 4 4 4 ====================== 1x1=1 1x2=2 2x2=4 1x3=3 2x3=6 3x3=9 1x4=4 2x4=8 3x4=12 4x4=16 1x5=5 2x5=10 3x5=15 4x5=20 5x5=25 1x6=6 2x6=12 3x6=18 4x6=24 5x6=30 6x6=36 1x7=7 2x7=14 3x7=21 4x7=28 5x7=35 6x7=42 7x7=49 1x8=8 2x8=16 3x8=24 4x8=32 5x8=40 6x8=48 7x8=56 8x8=64 1x9=9 2x9=18 3x9=27 4x9=36 5x9=45 6x9=54 7x9=63 8x9=72 9x9=81 ====================== 1x9=9 2x9=18 3x9=27 4x9=36 5x9=45 6x9=54 7x9=63 8x9=72 9x9=81 1x8=8 2x8=16 3x8=24 4x8=32 5x8=40 6x8=48 7x8=56 8x8=64 1x7=7 2x7=14 3x7=21 4x7=28 5x7=35 6x7=42 7x7=49 1x6=6 2x6=12 3x6=18 4x6=24 5x6=30 6x6=36 1x5=5 2x5=10 3x5=15 4x5=20 5x5=25 1x4=4 2x4=8 3x4=12 4x4=16 1x3=3 2x3=6 3x3=9 1x2=2 2x2=4 1x1=1 ====================== * * * * * * * * * * * * * * * * * * * * * * * * * ====================== * # * # * # * # * # * # * # * # * # * # * # * # * ====================== 100、 101、 103、 104、 106、 107、 109、 110、 112、 113、 115、 116、 118、 119、 121、 122、 124、 125、 127、 128、 130、 131、 133、 134、 136、 137、 139、 140、 142、 143、 145、 146、 148、 149、 共打印：34次！！！====================== 101 103 107 109 113 127 131 137 139 1494，Scanner
import java.util.Scanner;
public class KeyScanner {
public static void main(String[] args) {
//创建一个扫描器对象，用于接收键盘数据
Scanner scanner = new Scanner(System.in);
// next方式接收字符串
System.out.println("Next方式接收:");
// 判断用户还有没有输入字符
if (scanner.hasNext()) {
String str = scanner.next();
System.out.println("输入内容：" + str);
}
System.out.println("nextLine方式接收：");
if (scanner.hasNextLine()) {
String str2 = scanner.nextLine();
System.out.println("输入内容：" + str2);
}
// 凡是属于IO流的类如果不关闭会一直占用资源.要养成好习惯用完就关掉.就好像你接水完了要关 水龙头一样.很多下载软件或者视频软件如果你不彻底关,都会自己上传下载从而占用资源,你就会觉得 卡,这一个道理.
scanner.close();
}
}
5，Switch
public class Switch {
public static void main(String []args){
System.out.println("请输入一个数：");
Scanner sc=new Scanner(System.in);
int num=sc.nextInt();
switch (num){
case 1://"1"为输入语句
System.out .println("一");
break;
case 2:
System.out .println("二");
break;
case 3:
System.out .println("三");
break;
case 4:
System.out .println("四");
break;
case 5:
System.out .println("五");
break;
case 6:
System.out .println("六");
break;
default:
System.out.println("数字不合法!");
}
}
}
6，While
public class While {
public static void main(String[] args) {
//打印0-100的总和以及奇数和and偶数和
int sum = 0;
int i = 1;
int jishu = 0;
int oushu = 0;
while (i <= 100) {
sum += i;
if (i % 2 == 1) {
jishu += i;
} else {
oushu += i;
}
i++;
}
System.out.println("1-100的总和：" + sum);
System.out.println("1-100的奇数和：" + jishu);
System.out.println("1-100的偶数和：" + oushu);
System.out.println("======================");
//打印一百以内的数，每行5个数
int a = 0;
while (a < 100) {
a++;
System.out.print(a + "t");
if (a % 5 == 0) {
System.out.println();
}
}
}
}
