添加两个多维数组，并在一个新的列表中打印生成的多数组JAVA

Question

我想添加两个多数组在一起的数字，并在另一个多dim.-数组中打印出来，这里是代码我'到目前为止，但它显示了这个错误“不兼容的类型：double不能转换为double [] []”每次，任何人都可以请帮忙吗？

import java.util.*; 
public class AddMatrices 
{ 
public static void main(String[] args) 
{ 
    Scanner scan = new Scanner(System.in); 
    double[][] list1 = new double [3][3]; 
    double[][] list2 = new double [3][3]; 
    double[][] list3 = new double [3][3]; 

    System.out.println("Enter your first 3-by-3 matrix row by row:"); 
    for(int row = 0; row<3; row++){ 
    for(int col = 0; col<3; col++){ 
     list1[row][col] = scan.nextDouble(); 
    } 
    } 
    System.out.println(); 
    System.out.println("Enter your second 3-by-3 matrix row by row:"); 
    for(int row2 = 0; row2<3; row2++){ 
    for(int col2 = 0; col2<3; col2++){ 
     list2[row2][col2] = scan.nextDouble(); 
    } 
    } 
    System.out.print("The sum of these two matrices is: "); 
    for(int row3 = 0; row3<3; row3++){ 
    for(int col3 = 0; col3<3; col3++){ 
     list3[row3][col3] = addMatrix(list1[row3][col3],list2[row3][col3]); 
     System.out.println(list3[row3][col3] + " "); 
    } 
    System.out.println(); 
    } 
} 
public static double[][] addMatrix(double[][] a, double[][] b){ 
double[][] output = new double [a.length][a[0].length]; 
for(int row = 0; row<a.length; row++){ 
    for(int col = 0; col<a[row].length; col++){ 
     output[row][col] = a[row][col] + b[row][col]; 
    } 
    } 
    return output; 
} 
} 

更新后的代码（它的工作原理耶非常感谢你们！）：

import java.util.*; 
public class AddMatricies 
{ 
public static void main(String[] args) 
{ 
    Scanner scan = new Scanner(System.in); 
    boolean rep = false; 

    while(rep == false){ 

    double[][] list1 = new double [3][3]; 
    double[][] list2 = new double [3][3]; 
    double[][] list3 = new double [3][3]; 

    //asks for the first matrix 
    System.out.println("Enter your first 3-by-3 matrix row by row:"); 
    for(int row = 0; row<3; row++){ 
    for(int col = 0; col<3; col++){ 
     list1[row][col] = scan.nextDouble(); 
    } 
    } 
    //asks for the second matrix 
    System.out.println(); 
    System.out.println("Enter your second 3-by-3 matrix row by row:"); 
    for(int row2 = 0; row2<3; row2++){ 
    for(int col2 = 0; col2<3; col2++){ 
     list2[row2][col2] = scan.nextDouble(); 
    } 
    } 
    //add both matrices 
    System.out.println("The sum of these two matrices is: "); 
    for(int row3 = 0; row3<3; row3++){ 
    for(int col3 = 0; col3<3; col3++){ 
     list3 = addMatrix(list1,list2); //where the main changes are 
     System.out.print(list3[row3][col3] + " "); 
    } 
    System.out.println(); 
    } 
    System.out.println(); 
    System.out.print("Would you like to go again? "); 
    String dec = scan.next(); 
    if(dec.equalsIgnoreCase("yes")){ 
    rep = false; 
    } 
    else 
    rep = true; 
    } 
} 
//the method for adding both matrices 
public static double[][] addMatrix(double[][] a, double[][] b){ 
double[][] output = new double [a.length][a[0].length]; 
for(int row = 0; row<a.length; row++){ 
    for(int col = 0; col<a[row].length; col++){ 
     output[row][col] = a[row][col] + b[row][col]; 
    } 
    } 
    return output; 
} 
} 

Answer 1

你addMatrix方法期望数组作为参数和你逝去的双...作为T.Hry正确地指出，这是线。

Answer 2

只要避免使用addMatrix方法，因为它不会为代码增加值并产生问题。代码应该是这样的：

import java.util.*; 
public class AddMatrices 
{ 
public static void main(String[] args) 
{ 
    Scanner scan = new Scanner(System.in); 
    double[][] list1 = new double [3][3]; 
    double[][] list2 = new double [3][3]; 
    double[][] list3 = new double [3][3]; 

    System.out.println("Enter your first 3-by-3 matrix row by row:"); 
    for(int row = 0; row<3; row++){ 
    for(int col = 0; col<3; col++){ 
     list1[row][col] = scan.nextDouble(); 
    } 
    } 
    System.out.println(); 
    System.out.println("Enter your second 3-by-3 matrix row by row:"); 
    for(int row2 = 0; row2<3; row2++){ 
    for(int col2 = 0; col2<3; col2++){ 
     list2[row2][col2] = scan.nextDouble(); 
    } 
    } 
    System.out.print("The sum of these two matrices is: "); 
    for(int row3 = 0; row3<3; row3++){ 
    for(int col3 = 0; col3<3; col3++){ 
     list3[row3][col3] = list1[row3][col3]+list2[row3][col3]; 
     System.out.println(list3[row3][col3] + " "); 
    } 
    System.out.println(); 
    } 
} 

}