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); }}
Result:Method 2: JOptionPane input content is confirmed As for string values, as long as they are not determined, they are all null
public class a { public static void main(String[] args) { String w = JOptionPane.showInputDialog("请输入词汇:"); System.out.println(w); }}Result:
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 outputpublic class a { public static void main(String[] args) { int w = 1; int a = 2; System.out.print(w); System.out.print(a); }}Result:
public class a { public static void main(String[] args) { int w = 1; int a = 2; System.out.println(w); System.out.println(a); }}Result:
%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
public class a { public static void main(String[] args) { int w = 1; int a = 2; System.out.printf("w=%d a=%d", w, a); }}Result:
public class a { public static void main(String[] args) { if (1>2){ System.out.println("A"); }else { System.out.println("B"); } }}
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
public 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"); } }}switch case default
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); }}
result:
Loop statement
public class a { public static void main(String[] args) { for (int i = 0; i <p> Result: </p>
for in
public class a { public static void main(String[] args) { int[] a = {1, 2, 3, 4, 5}; for (int i : a) { System.out.println(i); } }}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]
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 (i
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;}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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