连接两个 if else 语句时如何修复错误？

Question

I am new at java and creating my first project which is a calculator using intellij. I have created two if else statements the first one takes the average given by the user and turns it into a grade. The second one is supposed to take the grade then turn it into a gpa. i have declared String grade; and String gpa.

  if (avg >= 90.0 ) {
    grade = "A";
  } else if (avg >=80.0) {
    grade = "B";
  } else if (avg >=70.0){
    grade = "C";
  } else if (avg >=60.0) {
    grade = "D";
  } else {
    grade = "F";
  }
  System.out.println("Grade is  " + grade );
  if (grade = A ) {      
    gpa = "4.0";        
  } else if (grade = B) { 
    gpa = "3.0";        
  }

Edit: The grade equals solution fixes the first error with the red underline but it doesn't compile. So I ended up using a switch statement instead in order to get two print statements.

Answer 1

if (avg >= 90.0 ) {
   grade = "A";
} else if (avg >=80.0) {
   grade = "B";
} else if (avg >=70.0) {
   grade = "C";
} else if (avg >=60.0) {
   grade = "D";
} else {
   grade = "F";
}
System.out.println("Grade is  " + grade );
if (grade.equals("A")) {      
   gpa = "4.0";        
} else if (grade.equals("B")) { 
   gpa = "3.0";        
}

Answer 2

Several problems:

if (grade = A ) 

to check if it's equal, you should use == (for comparing references) or equals for string.

A is not a variable, but a string you want to compare to, so it should be "A"

there's no really point in doing it in two separate if's. do it once:

if (avg >= 90.0 ) {
   grade = "A";
   gpa = "4.0";
} else if (avg >=80.0) {
   grade = "B";
   gpa = "3.5";
} else if (avg >=70.0){
...
...