This article brings you relevant knowledge about java, which mainly introduces related issues about process control, including input and output, branch statements and loop statements, etc. I hope it will be helpful to you. Everyone is helpful.
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Method 1: java.util.Scanner
The code is as follows:Generate a Scanner object, output "Please enter your name:", return the input string and assign it to name, output "%nWelcome %s" where %n means line break %s means name
public class a { public static void main(String[] args) { var sc = new Scanner(System.in); System.out.println("请输入姓名:"); String name = sc.nextLine(); System.out.printf("%n欢迎你:%s", name); }}Copy after login
Result:Method 2: JOptionPane input content is confirmed As for string values, as long as they are not determined, they are all null
Result:public class a { public static void main(String[] args) { String w = JOptionPane.showInputDialog("请输入词汇:"); System.out.println(w); }}Copy after login
Output
Method one: System.out.print(); Output to the consoleCode demonstration:Method two: System.out.println(); Output to the console and wrap
Method 3: System.out.printf(); format the output to the console
The first method is direct without line breaks Output
Second line break outputResult:public class a { public static void main(String[] args) { int w = 1; int a = 2; System.out.print(w); System.out.print(a); }}Copy after login
Result:public class a { public static void main(String[] args) { int w = 1; int a = 2; System.out.println(w); System.out.println(a); }}Copy after login
%d means an int type variable, which means replacing the first %d with the value of w and the second %d with the value of a
Result:public class a { public static void main(String[] args) { int w = 1; int a = 2; System.out.printf("w=%d a=%d", w, a); }}Copy after login
public class a { public static void main(String[] args) { if (1>2){ System.out.println("A"); }else { System.out.println("B"); } }}Copy after login
Multiple judgments are as follows: First judgment If not, proceed to the next judgment, execute it when the return value is true, otherwise execute else
switch case defaultpublic class a { public static void main(String[] args) { if (1 > 2) { System.out.println("A"); } else if (1 > 0) { System.out.println("B"); } else { System.out.println("C"); } }}Copy after login
break means to exit the current judgment, which means that there is no need to judge again laterdefault means the default value, when there is no match The default is this
public class a { public static void main(String[] args) { int w=1; String wk = ""; switch (w) { case 2: wk = "星期一"; break; case 3: wk = "星期二"; break; case 4: wk = "星期三"; break; case 5: wk = "星期四"; break; case 6: wk = "星期五"; break; case 7: wk = "星期六"; break; default: wk = "星期日"; break; } System.out.println(wk); }}Copy after login
result:
Loop statement
public class a { public static void main(String[] args) { for (int i = 0; i <p> Result: </p>Copy after login
for in
i corresponds to the value in the table below of array a, which is equivalent to looping output a[0],a[1]a[2],a [3]The value of a[4]public class a { public static void main(String[] args) { int[] a = {1, 2, 3, 4, 5}; for (int i : a) { System.out.println(i); } }}Copy after login
while do while
while(condition){}Execute the statement if the conditions are met, exit if not.
- Result:
public class a { public static void main(String[] args) { int i = 0; while (iCopy after login
do while
public class a { public static void main(String[] args) { int i = 0; do { i++; System.out.println(i); } while (i <br>The output is executed first and then judged. Therefore, the condition i<blockquote><p> result: </p></blockquote><p></p><h3>break continue</h3><blockquote><p><strong>break;</strong> 终止当前循环语句<br><strong>continue;</strong> 结束这一次循环,立即准备开启下一次循环</p></blockquote><pre class="brush:php;toolbar:false">int i = 0;while (++i 10) break;}Copy after login当i被2整除就跳过这一次,进行下一次循环。当i大于10就结束循环。
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