10!=2 is getting true and "Hello " 10!=2 compilation error-CodePudding

I am preparing for Oracle certification exam so could you explain how 10!=2 is getting true and compilation error, I have mention a small program below. 10!=2 : why it is true "Hello " 10!=2 : why it is compile time error

public class Demo1 {

public static void main(String[] args1) {   
    System.out.println(10!=2);  //Output is True
    System.out.println("Hello " 10!=2); //Compile Time Error
}

}

CodePudding user response：

Please check basics of java and generally programming. '==' sign checks if values are the same, '=!' checks if values are not the same. So 10!=2 means is 10 different than 2, and you get 'true'.

CodePudding user response：

for concat boolean with string in java you first need to store answer in a variable. try using this.

public static void main(String[] args1) {
    boolean a=10!=2;
    System.out.println(a);  //Output is True
    System.out.println("Hello " a);// Output is Hello true
}