自定义数组String 类型查找出错

Question

//不知道为什么查找一直出错
//请问各位大佬有知道原因的吗？
package Kid;

import java.util.Scanner;

public class AC {
    public static void main(String[] args) {
        Scanner sd = new Scanner(System.in);
        System.out.println("请输入小朋友人数：");
        Kid k = new Kid();
        Kid[] m = new Kid[sd.nextInt()];
        for(int i=0;i<m.length;i++){
            m[i]=new Kid();
            System.out.println("请输入第" + (i + 1) + "个小朋友");
            String name = sd.next();
            int age = sd.nextInt();
            m[i].name=name;
            m[i].age=age;
        }

        System.out.println("输入完成-请输入需要查找的小朋友：");
        String na=sd.next();
        k.setName(na);
        int temp= k.isExist(m);
        if(temp==-1) {
         System.out.println("有误");
        }

        else {
            System.out.println("小朋友是第" + (temp + 1) + "个小朋友");
            System.out.println(m[temp].name + "今年" + m[temp].age + "岁啦");
        }
    }
}

class Kid {
    int age;
    String name;
    void setName(String n){
        this.name=n;
    }
    void setKid(String name,int age){
        this.name=name;
        this.age=age;
    }
    int isExist(Kid[] a) {
        for (int i=0;i<a.length-1;i++){
            if(a[i].name==this.name)
                return i;
        }
        return -1;
    }
}

Answer 1

字符串比较需要用equals()
if(a[i].name==this.name)
改为
if(a[i].name.equals(this.name))

代码修改如下：

package Kid;
import java.util.Scanner;
public class AC {
    public static void main(String[] args) {
        Scanner sd = new Scanner(System.in);
        System.out.println("请输入小朋友人数：");
        Kid k = new Kid();
        Kid[] m = new Kid[sd.nextInt()];
        for(int i=0;i<m.length;i++){
            m[i]=new Kid();
            System.out.println("请输入第" + (i + 1) + "个小朋友");
            String name = sd.next();
            int age = sd.nextInt();
            m[i].name=name;
            m[i].age=age;
        }
        System.out.println("输入完成-请输入需要查找的小朋友：");
        String na=sd.next();
        k.setName(na);
        int temp= k.isExist(m);
        if(temp==-1) {
         System.out.println("有误");
        }
        else {
            System.out.println("小朋友是第" + (temp + 1) + "个小朋友");
            System.out.println(m[temp].name + "今年" + m[temp].age + "岁啦");
        }
    }
}
class Kid {
    int age;
    String name;
    void setName(String n){
        this.name=n;
    }
    void setKid(String name,int age){
        this.name=name;
        this.age=age;
    }
    int isExist(Kid[] a) {
        for (int i=0;i<a.length-1;i++){
            if(a[i].name.equals(this.name))
                return i;
        }
        return -1;
    }
}