From scratch learn JAVA-3. Store and modify variable information in the program, java-3 variable

From scratch learn JAVA-3. Store and modify variable information in the program, java-3 variable

1. Create a variable;

2. Use different types of variables;

3. Store values in variables;

4. Use variables in mathematical expressions;

5. Assign the value of a variable to another variable;

6. Increment/decrease the value of the variable.

Program Variable: use different types of variables and assign initial values

1 package com. jsample; 2 3 public class Variable {4 public static void main (String [] args) {5 int tops; // integer Variable 6 float gpa without initial values; // Single-precision floating point variable 7 char key = 'C' without initial values; // String productName = "Larvets "; // string variable 9 whose initial value is "Larvets"} // This program has no output 10}

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Program PlaneWeight: calculates and outputs The Weight Values of humans on different planets in the solar system

1 package com. jsample; 2 3 public class PlaneWeight {4 public static void main (String [] args) {5 System. out. print ("Your weight on Earth is"); 6 double weight = 178; 7 System. out. println (weight); // print () will not automatically wrap, println () Will 8 9 System. out. print ("Your weight on Mercury is"); 10 double mercury = 178 *. 378; 11 System. out. println (mercury); 12 13 System. out. print ("Your weight on Moon is"); 14 double moon = 178 *. 166; 15 System. out. println (moon); 16 17 System. out. print ("Your weight on Jupiter is"); 18 double jupiter = 178*2.364; 19 System. out. println (jupiter); 20} 21}

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Program PlaneWeightPlus: calculates and outputs the weights of people on different planets in more solar systems

1 package com. jsample; 2 3 public class PlaneWeightPlus {4 public static void main (String [] args) {5 System. out. print ("Your weight on Earth is"); 6 double weight = 178; 7 System. out. println (weight); // print () will not automatically wrap, println () Will 8 9 System. out. print ("Your weight on Mercury is"); 10 double mercury = weight *. 378; 11 System. out. println (mercury); 12 13 System. out. print ("Your weight on Moon is"); 14 double moon = weight *. 166; 15 System. out. println (moon); 16 17 System. out. print ("Your weight on Jupiter is"); 18 double jupiter = weight * 2.364; 19 System. out. println (jupiter); 20 21 System. out. print ("Your weight on Hesperus is"); 22 double hesperus = weight *. 907; 23 System. out. println (hesperus); 24 25 System. out. print ("Your weight on Uranus is"); 26 double uranus = weight *. 889; 27 System. out. println (uranus); 28} 29}

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Program SquareSum: calculates the sum of squares of integer x and y and outputs

1 package com. jsample; 2 3 public class SquareSum {4 public static void main (String [] args) {5 int x = 1; 6 int y = 1; 7 System. out. println (x * x + y * y); // sum of squares of output 8} 9}

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