在Java中使用方法输入输出变量数组？

Question

我有两个类，测试类和主类。类测试有两个属性a和b。我想让程序与数组和用户输入的值一起工作。

public class Testing{
private String a,b;
public Testing(a,b){
    this.a=a;
    this.b=b;
 }  
public void getA(){
    return a;
 }
public void getB(){
    return b;
 }
}

下一个是我的主类

public class Main{
public static void main(String[] args){
Scanner ss = new Scanner(System.in);
Scanner s = new Scanner(System.in);
int x,i;
System.out.print("How many lines? ");
x = s.nextInt();
//method inputData
Testing ts[] = new Testing[x];
for (i=0; i<x; i++)
    System.out.print("Enter Value A :"); String a = ss.nextLine();
    System.out.print("Enter Value B "); String b = s.nextInt();
    ts[i] = new Testing(a,b);
 }
//method outputData
System.out.println("Output---");
for(i=0; i<x; i++){
    System.out.print("Value A"+i+" "+ts[i].getA());
    System.out.print("Value B"+i+" "+ts[i].getB());
 }
}

它实际上工作得很好，但我想将下面//方法inputData和//方法outputData下面的代码从Main转移到测试中。所以，我只是从Main调用方法inputData()和outputData()。但我不知道该怎么做。如果你能帮我，我将不胜感激。

Answer 1

首先，这些方法应该在main方法之外声明。只需将方法的部分复制到测试文件即可。然后，实例化一个测试对象：

Testing test = new Testing(...)
test.inputData()
test.outputData()

Answer 2

我不明白你为什么要这么做，但你可以试着这样做；

1.

Testing.java；

public class Testing {
    private String a, b;

    public Testing(String a, String b) {
        this.a = a;
        this.b = b;
    }

    public String getA() {
        return a;
    }

    public String getB() {
        return b;
    }

    public static int outputData(int x, Testing[] ts) {
        int i;
        for (i = 0; i < x; i++) {
            System.out.print("Value A" + i + " " + ts[i].getA());
            System.out.print("Value B" + i + " " + ts[i].getB());
        }
        return i;
    }

    public static Testing[] inputData(Scanner ss, Scanner s, int x) {
        int i;
        Testing ts[] = new Testing[x];
        for (i = 0; i < x; i++) {
            System.out.print("Enter Value A :");
            String a = ss.nextLine();
            System.out.print("Enter Value B ");
            String b = s.nextLine();
            ts[i] = new Testing(a, b);
        }
        return ts;
    }
}

和Main.java；

public class Main {
    public static void main(String[] args) {
        Scanner ss = new Scanner(System.in);
        Scanner s = new Scanner(System.in);
        int x, i;
        System.out.print("How many lines? ");
        x = s.nextInt();
//method inputData
        Testing[] ts = Testing.inputData(ss, s, x);
//method outputData
        System.out.println("Output---");
        i = Testing.outputData(x, ts);
    }

}

2.

同样，正如@Fabiotk所说，你可以做inputData和outputData方法non-static，并使用创建类对象。

Testing.java；

public class Testing {
    private String a, b;

    public Testing(String a, String b) {
        this.a = a;
        this.b = b;
    }

    public String getA() {
        return a;
    }

    public String getB() {
        return b;
    }

    public int outputData(int x, Testing[] ts) {
        int i;
        for (i = 0; i < x; i++) {
            System.out.print("Value A" + i + " " + ts[i].getA());
            System.out.print("Value B" + i + " " + ts[i].getB());
        }
        return i;
    }

    public Testing[] inputData(Scanner ss, Scanner s, int x) {
        int i;
        Testing ts[] = new Testing[x];
        for (i = 0; i < x; i++) {
            System.out.print("Enter Value A :");
            String a = ss.nextLine();
            System.out.print("Enter Value B ");
            String b = s.nextLine();
            ts[i] = new Testing(a, b);
        }
        return ts;
    }
}

和Main.java；

  public class Main {
    public static void main(String[] args) {
        Scanner ss = new Scanner(System.in);
        Scanner s = new Scanner(System.in);
        Testing test = new Testing("a", "b");

        int x, i;
        System.out.print("How many lines? ");
        x = s.nextInt();
        //method inputData
        Testing[] ts = test.inputData(ss, s, x);
        //method outputData
        System.out.println("Output---");
        test.outputData(x, ts);
    }
}

Answer 3

你可以这样做，但是这些方法应该在main方法之外创建:要调用这些方法，你应该在main方法中这样做：

  Testing  ts = new Testing();
    ts.inputData(4);
    ts.outputData(3);

要创建方法，请执行以下操作：

  //method inputData
  Testing ts[] = new Testing[x];
   for (i=0; i<x; i++)
  System.out.print("Enter Value A :"); String a = ss.nextLine();
  System.out.print("Enter Value B "); String b = s.nextInt();
   ts[i] = new Testing(a,b);
}

方法inputData变成：

 public int[] inputData(int x){
    Testing ts[] = new Testing[x];
     for (i=0; i<x; i++)
     System.out.print("Enter Value A :"); String a = ss.nextLine();
     System.out.print("Enter Value B "); String b = s.nextInt();
   ts[i] = new Testing(a,b);
   return ts;
   }

这一点：

 System.out.println("Output---");
for(i=0; i<x; i++){
System.out.print("Value A"+i+" "+ts[i].getA());
System.out.print("Value B"+i+" "+ts[i].getB());
}

成为方法outputData：

 public void outputData(int x){
  for(i=0; i<x; i++){
   System.out.print("Value A"+i+" "+ts[i].getA());
    System.out.print("Value B"+i+" "+ts[i].getB());
   }
 }