Gson把json串转换成java实体对象

public class Model {
private double Average;
private double Maximum;
private double Minimum;
private String instanceId;
private long timestamp;
private String userId;

public double getAverage() {
return Average;
}

public void setAverage(double average) {
Average = average;
}

public double getMaximum() {
return Maximum;
}

public void setMaximum(double maximum) {
Maximum = maximum;
}

public double getMinimum() {
return Minimum;
}

public void setMinimum(double minimum) {
Minimum = minimum;
}

public String getInstanceId() {
return instanceId;
}

public void setInstanceId(String instanceId) {
this.instanceId = instanceId;
}

public long getTimestamp() {
return timestamp;
}

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

public String getUserId() {
return userId;
}

public void setUserId(String userId) {
this.userId = userId;
}
}

String str = "{\"Average\":0.29,\"Maximum\":0.32,\"Minimum\":0.25,\"instanceId\":\"i-426auf2hf\",\"timestamp\":1449939900000,\"userId\":\"1467232540347717\"}";
Model model = new Gson().fromJson(str, Model.class);
System.out.println(model.getAverage());