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Java Version Used: JDK 1.7 Program 1: public static void main(String[] args){ String s1 = "abc"; String s2 = "abc"; System.out.println("s1 == s2 is:" + s1 == s2); } Output: false Explanation: Though here s1 object is equal to s2, the output will be false as here it's comparing the below strings for equality. s1 == s2 is:abc abc Program 2: public static void main(String[] args){ String s1 = "abc"; String s2 = "abc"; System.out.println(s1 == s2); } Output: True Program 3: public static void main(String[] args){ String s1 = "abc"; String s2 = "abc"; System.out.println("s1 == s2 is:" + (s1 == s2)); } Output: s1 == s2 is:true Program 4: public static void main(String[] args){ String s1 = "abc"; String s2 = "abc"; System.out.println("s1.equals(s2) is:" + s1.equals(s2)); } Output: s1.e...

10 Common Core Java Programs with Code Problem:1 Converting a decimal number to Binary Number. Code: import java.io.*; import java.util.*; import java.text.*; import java.math.*; import java.util.regex.*; public class Solution {     public static void main(String[] args) {         Scanner in = new Scanner(System.in);         int n = in.nextInt();         convertDecToBinary(n);     }     public static void convertDecToBinary(int a){         ArrayList<Integer> arr = new ArrayList<Integer>();         while(a > 0){             arr.add(a%2);             a = (int) a/2;         }         Collections.reverse(arr);         System.out.println(arr);     } }