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    private double getInch() {
            DisplayMetrics display = MainActivity.this.getResources().getDisplayMetrics();
            int height = (int) (display.heightPixels / display.ydpi);
            int width = (int) (display.widthPixels / display.xdpi);
 
            return Math.sqrt((width * width) + (height * height));
        }
 
    int inch = (int)getInch();
 
	private void setTextSize() {
 		if (inch >= 10) { //10-inch
            reserveFieldStoreText.setTextSize(TypedValue.COMPLEX_UNIT_SP, 26);
            reserveFieldDateText.setTextSize(TypedValue.COMPLEX_UNIT_SP, 26);
            reserveFieldTimeText.setTextSize(TypedValue.COMPLEX_UNIT_SP, 26);
        } else if (inch >= 7) { //7-inch
            reserveFieldStoreText.setTextSize(TypedValue.COMPLEX_UNIT_SP, 22);
            reserveFieldDateText.setTextSize(TypedValue.COMPLEX_UNIT_SP, 22);
            reserveFieldTimeText.setTextSize(TypedValue.COMPLEX_UNIT_SP, 22);
        } else {
            reserveFieldStoreText.setTextSize(TypedValue.COMPLEX_UNIT_SP, 14);
            reserveFieldDateText.setTextSize(TypedValue.COMPLEX_UNIT_SP, 14);
            reserveFieldTimeText.setTextSize(TypedValue.COMPLEX_UNIT_SP, 14);
        }
  }
 
 

Main.java:1: error: class, interface, or enum expected
    private double getInch() {
            ^
Main.java:3: error: class, interface, or enum expected
            int height = (int) (display.heightPixels / display.ydpi);
            ^
Main.java:4: error: class, interface, or enum expected
            int width = (int) (display.widthPixels / display.xdpi);
            ^
Main.java:6: error: class, interface, or enum expected
            return Math.sqrt((width * width) + (height * height));
            ^
Main.java:7: error: class, interface, or enum expected
        }
        ^
Main.java:11: error: class, interface, or enum expected
	private void setTextSize() {
	        ^
Main.java:14: error: class, interface, or enum expected
            reserveFieldDateText.setTextSize(TypedValue.COMPLEX_UNIT_SP, 26);
            ^
Main.java:15: error: class, interface, or enum expected
            reserveFieldTimeText.setTextSize(TypedValue.COMPLEX_UNIT_SP, 26);
            ^
Main.java:16: error: class, interface, or enum expected
        } else if (inch >= 7) { //7-inch
        ^
Main.java:18: error: class, interface, or enum expected
            reserveFieldDateText.setTextSize(TypedValue.COMPLEX_UNIT_SP, 22);
            ^
Main.java:19: error: class, interface, or enum expected
            reserveFieldTimeText.setTextSize(TypedValue.COMPLEX_UNIT_SP, 22);
            ^
Main.java:20: error: class, interface, or enum expected
        } else {
        ^
Main.java:22: error: class, interface, or enum expected
            reserveFieldDateText.setTextSize(TypedValue.COMPLEX_UNIT_SP, 14);
            ^
Main.java:23: error: class, interface, or enum expected
            reserveFieldTimeText.setTextSize(TypedValue.COMPLEX_UNIT_SP, 14);
            ^
Main.java:24: error: class, interface, or enum expected
        }
        ^
15 errors

Standard output is empty