此类应提供默认构造函数（没有参数的公共构造函数）[重复]

Question

错误：错误：此类应提供默认构造函数（没有参数的公共构造函数）（net.skinnycat.accelerometertest.AccelData）[Instantiatable]

如何解决这个问题？

这是我的代码：

package net.skinnycat.accelerometertest;

public class AccelData{
private long timestamp;
private double x;
private double y;
private double z;

public AccelData(long timestamp, double x, double y, double z) {
    this.timestamp = timestamp;
    this.x = x;
    this.y = y;
    this.z = z;
}

public long getTimestamp() {
    return timestamp;
}

public void setTimestamp(long timestamp) {
    this.timestamp = timestamp;
}

public double getX() {
    return x;
}

public void setX(double x) {
    this.x = x;
}

public double getY() {
    return y;
}

public void setY(double y) {
    this.y = y;
}

public double getZ() {
    return z;
}

public void setZ(double z) {
    this.z = z;
}

public String toString() {
    return "t=" + timestamp + ", x=" + x + ", y=" + y + ", z=" + z;
}
}`

Answer 1

你需要添加

public AccelData(){}你的班级