java - 插入赋值运算符表达式以完成eclipse错误中的表达式

Question

行:

System.out.println("Welcome to John Doe's shipping calculator!");

我明白了

"Syntax error, insert "AssignmentOperator Expression" to complete expression" in eclipse

class calc {    
        Shipment s = new Shipment();
        Scanner input = new Scanner(System.in);
        System.out.println("Welcome to John Doe's shipping calculator!");
        System.out.println("Enter first package dimensions" );
        Package package1 = new Package();
        System.out.println("Enter length");package1.inputLength(input.nextDouble());
        System.out.println("Enter width");package1.inputWidth(input.nextDouble());
        System.out.println("Enter height");package1.inputHeight(input.nextDouble());
        Package package2 = new Package();
        System.out.println("Enter second package dimensions" );
        System.out.println("Enter length");package2.inputLength(input.nextDouble());
        System.out.println("Enter width");package2.inputWidth(input.nextDouble());
        System.out.println("Enter height");package2.inputHeight(input.nextDouble());
        System.out.print("First package dimensions:" ); package1.displayDimensions();
        System.out.print("Second package dimensions:"); package2.displayDimensions();
        s.cost1 = s.calculateCost(package1);
        s.cost2 = s.calculateCost(package2);
        System.out.println("Package 1 will cost "+  Math.round(s.cost1 * 100.0) /100.0 +  " to ship");
        System.out.println("Package 2 will cost "+ Math.round(s.cost2 * 100.0) /100.0 + " to ship");
        s.display();            
}

为什么？

Answer 1

您无法直接在类中打印一行(或调用方法)，请尝试将其放入方法中。

class calc{
    public void myMethod(){
        Shipment s = new Shipment();
        Scanner input = new Scanner(System.in);
        System.out.println("Welcome to John Doe's shipping calculator!");
        System.out.println("Enter first package dimensions" );
        Package package1 = new Package();
        //REST OF CODE
    }
}

然后在需要的地方调用该方法。