The use of "==" and equals methods in java

Author：Eve Cole Update Time：2024-11-18 18:48:01

Copy the code code as follows:

public class equalsDemo {
public static void main(String[] args){

/*When using == to determine whether two variables are equal, if the two variables are variables of basic data types and both are numerical types, then as long as the values of the two variables are equal, using == to determine will return true* /

int i=65;
float f=65.0f;
System.out.println(i==f);//true
char c='A';
System.out.println(c==f);//true
//But for two reference type variables, the == judgment will return true only when they point to the same object.
String str1=new String("hello");
String str2=new String("hello");
System.out.println(str1==str2);//false
System.out.println(str1.equals(str2));//true
}

}

Copy the code code as follows:

public class IntegerDemo{
public static void main(String[] args){
Integer i1 =127;
Integer i2 =127;
System.out.println(i1==i2);//true
Integer i3 =128;
Integer i4 =128;
System.out.println(i3==i4);//false
//flyweight mode
}

}