demo1
public class HelloWorld {
public static void main(String[] args){
String strA = "mldn";// 直接赋值定义字符串
String strB = new String("mldn");//构造方法定义字符串
String strC = strB;// 引用传递
System.out.println(strA == strB);//false
System.out.println(strA == strC);//false
System.out.println(strB == strC);//true
}
}
demo2 通过自定义类型使用“==”
class Dept {} // 随意定义一个空类
public class HelloWorld {
public static void main(String[] args){
Dept deptA = new Dept();// 开辟堆内存
Dept deptB = new Dept();// 开辟堆内存
Dept deptC = deptB;// 引用传递,堆内存地址相同;
System.out.println(deptA == deptB);//false
System.out.println(deptA == deptC);//false
System.out.println(deptB == deptC);//true
}
}
demo3 equals 字符串内容比较
public class HelloWorld {
public static void main(String[] args){
String strA = "mldn";// 直接赋值定义字符串
String strB = new String("mldn");//构造方法定义字符串
System.out.println(strA.equals(strB));// true 字符串内容比较
}
}