Java 日食';标记“0”上的语法错误&引用;,此标记';后应为表达式;,我的语法哪里错了?
m_one中存在语法错误。它说: 标记“,”上的语法错误,此标记后应为表达式 我不明白这是从哪里来的。这是我的构造函数:Java 日食';标记“0”上的语法错误&引用;,此标记';后应为表达式;,我的语法哪里错了?,java,eclipse,object,syntax-error,Java,Eclipse,Object,Syntax Error,m_one中存在语法错误。它说: 标记“,”上的语法错误,此标记后应为表达式 我不明白这是从哪里来的。这是我的构造函数: package MainFunction; public class Main { public static void main(String[] args) { // TODO Auto-generated method stub Gun m_one = new Gun("M1", 30, ["Bleeding"], "semi-auto", ".1
package MainFunction;
public class Main {
public static void main(String[] args) {
// TODO Auto-generated method stub
Gun m_one = new Gun("M1", 30, ["Bleeding"], "semi-auto", ".15 cal", "lead", 8);
System.out.println("Java Works.");
}
}
effects[effects.length] = effect;
构造函数没有返回错误,但是当我使用它时,它会返回错误。问题出在哪里?在
m_one
的声明中,围绕“出血”的部分需要使用大括号而不是方括号。您正在尝试使用以下表达式创建和传递字符串数组:
package MainFunction;
public class Weapon {
Weapon(String name, int damage, String[] effects){
this.name = name;
this.damage = damage;
this.effects = effects;
}
private int damage;
public String name;
private String[] effects;
public void addEffect(String effect){
effects[effects.length] = effect;
}
}
class Gun extends Weapon {
private String type;
public String name;
private int damage;
public String[] effects;
private String ammoType;
private String bulletMaterial;
private int barrelLength;
private String fireType;
Gun( String name, int damage, String[] effects, String fireType, String ammoType, String bulletMaterial, int barrelLength) {
super(name, damage, effects);
// TODO Auto-generated constructor stub
this.name = name;
this.damage = damage;
this.effects = effects;
this.fireType = fireType;
this.ammoType = ammoType;
this.type = "ranged";
this.bulletMaterial = bulletMaterial;
this.barrelLength = barrelLength;
}
}
class Sword extends Weapon {
private String type;
public String name;
private int damage;
public String[] effects;
private int bladeLength;
private int hiltLength;
private String bladeMaterial;
Sword(String name, int damage, String[] effects, int barrelLength, int hiltLength, String bladeMaterial){
super(name, damage, effects);
this.name = name;
this.damage = damage;
this.effects = effects;
this.type = "melee";
this.bladeLength = bladeLength;
this.hiltLength = hiltLength;
this.bladeMaterial = bladeMaterial;
}
}
但是,这不是用于创建数组的Java语法。必须显式创建数组,指定类型,并使用大括号{}
来包含内容
["Bleeding"]
如果您愿意,您可以有多个元素:
new String[] {"Bleeding"}
另外,稍后在武器
的addEffect
方法中,您尝试通过指定超出数组长度的元素来确定数组的长度
new String[] {"Bleeding", "Damaging"};
在Java中,数组一旦创建就有固定的大小,因此这将抛出ArrayIndexOutOfBoundsException
。如果需要可变长度数组,请将字符串[]
替换为列表
。首先,在构造函数中:
package MainFunction;
public class Main {
public static void main(String[] args) {
// TODO Auto-generated method stub
Gun m_one = new Gun("M1", 30, ["Bleeding"], "semi-auto", ".15 cal", "lead", 8);
System.out.println("Java Works.");
}
}
effects[effects.length] = effect;
然后在定义addEffect
时:
List<String> effects;
您不需要在main
中创建数组,而需要创建List
的实现并将其传入
effects.add(effect);
List effects=new ArrayList();
添加(“出血”);
影响。添加(“损害”);
枪m_one=新枪(“M1”,30,效果,“半自动”,“0.15 cal”,“铅”,8);
您能添加准确的错误消息吗?谢谢,我会尝试一下。我是Java新手。