[英]Why does it give me an error even though I declared rand?
import java.util.Random;
class perro{
private Float animo;
private Float umbral;
Random rand = new Random();
public perro(){
animo = rand.nextFloat() * (5+5)-5;
umbral = rand.nextFloat() * (0-20);
}
public Float getAnimo(){
return animo;
}
public Float getUmbral(){
return umbral;
}
private void psican(persona p){
this.animo = (rand.nextFloat() -0.5) * 10 + this.animo;
if (p.tieneGalleta()){
p.darGalleta();
this.animo += (1.0 / p.getConfiabilidad()) * (rand.nextInt(2));
}
System.out.println("Mi nuevo animo es: " + this.animo);
}
我收到了這個錯誤:
"error: incompatible types: double cannot be converted to Float
this.animo = (rand.nextFloat() -0.5) * 10 + this.animo;"
我已經檢查了所有內容,但是從一開始就將所有內容都表示為浮點數。
因為0.5
是double
(不是float
)。 改變這個
this.animo = (rand.nextFloat() -0.5) * 10 + this.animo;
至
this.animo = (rand.nextFloat() -0.5f) * 10 + this.animo;
或者
this.animo += (rand.nextFloat() - 0.5f) * 10;
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