public class Test {
	public static void main(String[] args) {
	    String str1="good";
	    System.out.println(str1=="good");
	    System.out.println(str1.equals("good"));
	    
	    //==============================
		String str2="goodjob";
	    System.out.println(str2.substring(0, 4)=="good");
	    System.out.println(str2.substring(0, 4).equals("good"));
	}
}

  

true
true
false
true
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