Java 程式設計 -- 函數

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範例一：計算平方的函數

class Func1
{ 
  public static void main(String[] args)
  {
    int x = square(5);
    System.out.println("x="+x);
  }
 
  public static int square(int n) 
  {
    return n*n;
  }
}

範例二：陣列相加

class Func1
{ 
  public static void main(String[] args)
  {
    int a[][] = {{1,2}, 
                 {3,4}};
    int b[][] = {{5,6}, 
                 {7,8}};
    int c[][] = new int[2][2];
    add(a, b, c);
    System.out.println("=======a=======");
    print(a);
    System.out.println("=======b=======");
    print(b);
    System.out.println("=======c=======");
    print(c);
  }
 
  public static void add(int x[][], int y[][], int z[][])
  {
      for (int i=0; i<z.length; i++)
        for (int j=0; j<z[i].length; j++)
        {
            z[i][j] = x[i][j] + y[i][j];
        }
  }
 
  public static void print(int x[][])
  {
      for (int i=0; i<x.length; i++)
      {
        for (int j=0; j<x[i].length; j++)
          System.out.print(x[i][j]+" ");
        System.out.println();
    }
  }  
}