If statementdoesn't compare to the required strings and doesn't work with other if altough the variable value is same as the compared string

Having an issue when trying to compare strings in If statement.

private String browser = XMLreader.getData("browser");

if (browser == "chrome"){
    System.out.println(browser);
} // Will not print anything

if (browser != "chrome"){
    System.out.println(browser);
} // Will print chrome 

Any idea what am I missing?

Thanks