1. The comparison of strings in java is == to compare references, and equals to compare values
We often write if(str1==str2) habitually, which may cause problems in java
String a="abc";String b="abc"，
then a==b will return true. Because the value of a string in java is immutable, the same string will only be stored in memory
A copy, so a and b point to the same object;
String a=new String("abc"); String b=new String("abc");
Then a==b will return false, at this time a and b point to different objects.
2. Use the equals method to compare whether the contents of the strings are the same,
String a=new String("abc");
String b=new String("abc"); a.equals(b); will return true.
Usually, in order to avoid the above problems, the equals method is used to judge whether the strings are equal.
if(str1.equals(str2) ){
System.out.println("strings are equal");
}else{
System.out.println("strings are not equal");
}
1. The comparison of strings in java is == to compare references, and equals to compare values
We often write if(str1==str2) habitually, which may cause problems in java
String a="abc";String b="abc"，
then a==b will return true. Because the value of a string in java is immutable, the same string will only be stored in memory
A copy, so a and b point to the same object;
String a=new String("abc"); String b=new String("abc");
Then a==b will return false, at this time a and b point to different objects.
2. Use the equals method to compare whether the contents of the strings are the same,
String a=new String("abc");
String b=new String("abc"); a.equals(b); will return true.
Usually, in order to avoid the above problems, the equals method is used to judge whether the strings are equal.
if(str1.equals(str2) ){
System.out.println("strings are equal");
}else{
System.out.println("strings are not equal");
}