Question

我一直在使用这些代码，当用户输入他/她想要检查它是否在数组中的值时，我在部件中遇到了问题。

如何用Java检查数组中的对象？

public static void main (String args []) 
{
    String sInput1,sInput2,sLetters,s;
    int iInput1,i1,i2;
    boolean b1 = true;

    sInput1 = JOptionPane.showInputDialog("Enter the number of values in the array:");
    iInput1 = Integer.parseInt (sInput1);
    String Arr1[] = new String [iInput1];

    for (i1=0;i1<iInput1;i1++)
    {
        Arr1[i1] = JOptionPane.showInputDialog("Enter the values:");
        System.out.println("You entered " + Arr1[i1] + ".");
    }

    sInput2 = JOptionPane.showInputDialog("Enter the value you want to check in the array:");

    for (i1=0;i1<iInput1;i1++)
    {
        if (Arr1[i1].equals(sInput2))
        {
            b1=true;
        }
        else
        {
            b1=false;
        }
        if (b1 == true)
        {
            JOptionPane.showMessageDialog(null,"The value you want to check is in the array.","RESULT!",JOptionPane.INFORMATION_MESSAGE);
        }
        else
        {
            JOptionPane.showMessageDialog(null,"The value you want to check is not in the array.","RESULT!",JOptionPane.INFORMATION_MESSAGE);
        }
    }

Answer 1

使用：

b1 = Arrays.asList(Arr1).contains(sInput2);

Answer 2

首先，您必须将b1初始化为false：

boolean b1 = false;

然后你可以做检查：

for (i1 = 0; i1 < iInput1 && !b1; i1++)
    if (Arr1[i1].equals(sInput2))
        b1 = true;

最后，打印出结果：

if (b1)
    JOptionPane.showMessageDialog(null, "The value you want to check is in the array.", "RESULT!", JOptionPane.INFORMATION_MESSAGE);
else
    JOptionPane.showMessageDialog(null, "The value you want to check is not in the array.", "RESULT!", JOptionPane.INFORMATION_MESSAGE);

或者，很快：

JOptionPane.showMessageDialog(null, "The value you want to check is" + (b1 ? " " : " not ") + "in the array.", "RESULT!", JOptionPane.INFORMATION_MESSAGE);

如何检查数组中的对象？

2 个答案: