[英]Search in Hashmap
如果輸入值與hashmap
中的任何值匹配,則使用for循環將輸入值與hashmap
進行比較,然后代碼將打印所有相關值。
結果顯示我為NULL
System.out.println("Please enter time :");
Scanner scan = new Scanner(System.in);
String value = scan.nextLine();//Read input-time
Measurement measurement = measurements.get(value);//there can only be 1 Measurement for 1 time
if(measurement != null){
System.out.println(measurement);
}}
等級測量:
public void getTimeInfo(String value)
{
value = Measurements.get(time);
if (value == null) {
throw new MeasurementException();
}
System.out.println("The detailed info : " + this.time + "-" + this.temp+ " "+ this.wind+ "-" + this.humid );
}
}
}
按照你提到的三個步驟(忽略Json部分)並重用你的一些代碼,我可以提供你的代碼:
Main.java :
public class Main {
static HashMap<String, Measurement> measurements = new HashMap();
public static void main(String[] args) {
for (int i = 0; i < 3; i++) {//Create 3 measurements
String time = ""+i;
measurements.put(time, new Measurement(time, (float) i, (float) i, (float) i));
}
System.out.println("Please enter time :");
Scanner scan = new Scanner(System.in);
String value = scan.nextLine();//Read input-time
Measurement measurement = measurements.get(value);//there can only be 1 Measurement for 1 time
if(measurement != null){
System.out.println(measurement);
}
}
}
Measurement.java :
public class Measurement {
String time ;
Float temp;
Float wind;
Float humid;
int iD;
public Measurement(String d, Float t, Float w, Float h){
this.time = d;
this.temp = t;
this.wind = w;
this.humid = h;
}
@Override
public String toString() {
return "The detailed info : " + this.time + "-" + this.temp+ " "+ this.wind+ "-" + this.humid;
}
}
它可能不完全符合您的需求,但它可以是一個幫助。
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