java顯示字元的平方排布

❶ java 中，怎麼列印出一個字元串的所有排列

import java.util.Scanner;

public class Test {
public static void main(String[] args) {
String str = "";

Scanner scan = new Scanner(System.in);

str = scan.nextLine();

permutation(str.toCharArray(), 0);
}

public static void permutation(char[] str, int i) {
if (i >= str.length)
return;
if (i == str.length - 1) {
System.out.println(String.valueOf(str));
} else {
for (int j = i; j < str.length; j++) {
char temp = str[j];
str[j] = str[i];
str[i] = temp;

permutation(str, i + 1);

temp = str[j];
str[j] = str[i];
str[i] = temp;
}
}
}
}

❷ 用java編寫程序顯示字元編排圖案

publicclassTest2014112005{
publicstaticvoidmain(Stringargs[]){
String[][]strs=newString[][]{
{"","","","J","","","","","A","","","","V","","","","","","V","","","","","A","","",""},
{"","","","J","","","","A","","A","","","","V","","","","V","","","","","A","","A","",""},
{"J","","","J","","","A","A","A","A","A","","","","V","","V","","","","","A","A","A","A","A",""},
{"","J","J","","","A","","","","","","A","","","","V","","","","","A","","","","","","A"},};
for(inti=0;i<strs.length;i++){
for(intj=0;j<strs[i].length;j++){
System.out.print(strs[i][j]);
}
System.out.println();
}
}
}

這？

❸ 在java中數字的平方怎樣表示

在Java中，求一個數平方，可以：

tmp = n*n;

Math.pow(n,2)

拓展資料：平方是一種運算，比如，a的平方表示a×a，簡寫成a²，也可寫成a×a(a的一次方乘a的一次方等於a的2次方），例如4×4=16，8×8=64，平方符號為2。

❹ java中如何顯示字元串位置

java中輸出字元所在位置可以使用indexOf()函數
例子：
System.out.println("abcd".indexOf("b"));
結果輸出1
返回b字元在字元串abcd中第一次出現的位置

❺ java的平方表達式怎麼寫

「java」的平方表達式是pow (double x,double y)。

函數原型：double pow (double x,double y)。

功能：返回x的y次方。

如要在java中求9的平方，可寫作double pow(double 9，double 9)。

❻ java 輸入一個字元串,列印出該字元串中字元的所有排列

實現思路：就是輸入字元串後，通過遞歸的方式，循環每個位置和其他位置的字元。

importjava.util.Scanner;

publicclassDemo001{

publicstaticvoidmain(String[]args){
Stringstr="";

Scannerscan=newScanner(System.in);

str=scan.nextLine();

permutation(str.toCharArray(),0);
}

publicstaticvoidpermutation(char[]str,inti){
if(i>=str.length)
return;
if(i==str.length-1){
System.out.println(String.valueOf(str));
}else{
for(intj=i;j<str.length;j++){
chartemp=str[j];
str[j]=str[i];
str[i]=temp;

permutation(str,i+1);

temp=str[j];
str[j]=str[i];
str[i]=temp;
}
}
}
}

❼ java中怎麼給一個字元串弄平方呢比如要把讓x這個字元串帶上平方，用Math.pow(double,double).

public static double pow(double a,double b) 官方文檔就是這么定義的,你可以先把String類型轉為double類型,再進行平方啊