Question

Java运行 显示非法的表达式开始 这是为什么呀？

代码如下public abstract class Monster{ public String name; public double spAttackProbability=0.2; public Monster(String name){ this.name=name;} public Monster(String name,double spAttackProbability){ this.name=name; this.spAttackProbability=spAttackProbability;} final public int attack(){ int X = 0; if(Math.random()<spAttackProbability) X=specialAttack(); else{ X=(int) (Math.random() * 5 + 1); System.out.println(name+",of type"+this.getClass() +",attacks generically:"+X+"points damage caused."); return X; } public abstract int specialAttack(); public void move(int direction){ switch(direction){ case 1: System.out.println(this.name+" is moving 1 step NORTH."); System.out.println(); break; case 2: System.out.println(this.name+" is moving 1 step EAST."); System.out.println(); break; case 3: System.out.println(this.name+" is moving 1 step SOUTH."); System.out.println(); break; case 4: System.out.println(this.name+" is moving 1 step WEST."); System.out.println(); break;}}}

Answer 1

attack()没有返回值，我给你改了下

public abstract class Monster {
	public String name;
	public double spAttackProbability = 0.2;

	public Monster(String name) {
		this.name = name;
	}

	public Monster(String name, double spAttackProbability) {
		this.name = name;
		this.spAttackProbability = spAttackProbability;
	}

	final public int attack(){ 
		int X = 0; 
		if(Math.random()<spAttackProbability) 
			X=specialAttack(); 
		else{ 
			X=(int) (Math.random() * 5 + 1);
		System.out.println(name+",of type"+this.getClass() +",attacks generically:"+X+"points damage caused."); 
		return X;
		}
		return X;
	}

	public abstract int specialAttack();

	public void move(int direction) {
		switch (direction) {
		case 1:
			System.out.println(this.name + " is moving 1 step NORTH.");
			System.out.println();
			break;
		case 2:
			System.out.println(this.name + " is moving 1 step EAST.");
			System.out.println();
			break;
		case 3:
			System.out.println(this.name + " is moving 1 step SOUTH.");
			System.out.println();
			break;
		case 4:
			System.out.println(this.name + " is moving 1 step WEST.");
			System.out.println();
			break;
		}
	}
}

Answer 2

这个方法你写到了另一个方法内, 括号问题吧算是