常見筆試題

public class Main {

    public static void main(String[] args) {

        //[-128,127]
        Integer i1 = 10;
        Integer i2 = 10;
        System.out.println(i1 == i2); //true
        System.out.println(i1.equals(i2)); //true

        Integer i3 = -128;
        Integer i4 = -128;
        System.out.println(i3 == i4); //true
        System.out.println(i3.equals(i4)); //true
    }

 

public class Main {

    public static void main(String[] args) {

        //[-128,127]
        Integer i1 = 200;
        Integer i2 = 200;
        System.out.println(i1 == i2); //false
        System.out.println(i1.equals(i2)); //true

        Integer i3 = -128;
        Integer i4 = -128;
        System.out.println(i3 == i4); //true
        System.out.println(i3.equals(i4)); 
        //true
    }

 

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