第4天

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数组的转置:

1、前提条件是二维数组是正方的,即n行n列。

/**

 * 二维数据的转置

 */

public class ArrayTransDemo {


public static void main(String [] args){

String[][] arr = {{"a","b","c","d","e"},{"f","g","h","i","j"},{"k","l","m","n","o"},{"p","q","r","s","t"},{"u","v","w","x","y"}};

print(arr);

System.out.println("----转置后--------------------------");

trans(arr);

print(arr);

}

private static String [][] trans(String [][] arr){

for (int i = 0; i < arr.length; i++) {

for (int j = 0; j < arr[i].length; j++) {

if(j > i){

String temp = "";

temp = arr[i][j];

arr[i][j] = arr[j][i];

arr[j][i] = temp;

}

}

}

return arr;

}

private static void print(String [][] arr){

for (int i = 0; i < arr.length; i++) {

for (int j = 0; j < arr[i].length; j++) {

System.out.print(arr[i][j] + "\t");

}

System.out.println();

}

}

}


/**

 * 三维数组的打印

 */

public class Array3PrintDemo {


public static void main(String[] args) {

int [][][] arr = {{{1,2,3},{4,5,6},{7,8,9}},{{10,11,12},{13,14,15},{16,17,18}},{{19,20,21},{22,23,24},{25,26,27}}};

print(arr);

}


private static void print(int [][][] arr){

for (int i = 0; i < arr.length; i++) {

for (int j = 0; j < arr.length; j++) {

for (int k = 0; k < arr.length; k++) {

System.out.print(arr[j][i][k] +"\t");

}

System.out.print("|\t");

}

System.out.println();

}

}

}