Java Control Structures

Program control structures in Java include:

Sequential Structure: The program executes code sequentially according to the order of statements.
For example:
```
int a = 1;
int b = 2;
int c = a + b;
System.out.println(c);
```

Branching Structures:

if Statement: Selects different code paths based on conditions.
For example:

int num = 10;
if (num > 0) {
    System.out.println("num is positive");
} else if (num < 0) {
    System.out.println("num is negative");
} else {
    System.out.println("num is zero");
}

switch Statement: Selects different code paths based on the value of a variable.
For example:

int dayOfWeek = 2;
switch (dayOfWeek) {
    case 1:
        System.out.println("Monday");
        break;
    case 2:
        System.out.println("Tuesday");
        break;
    case 3:
        System.out.println("Wednesday");
        break;
    case 4:
        System.out.println("Thursday");
        break;
    case 5:
        System.out.println("Friday");
        break;
    default:
        System.out.println("Weekend");
        break;
}

Loop Structures:
- for Loop: Repeats a block of code until a specific condition is met to stop execution.
  For example:
```
for (int i = 0; i < 5; i++) {
    System.out.println(i);
}
```
- while Loop: Repeats a block of code while a specified condition remains true.
  For example:
```
int i = 0;
while (i < 5) {
    System.out.println(i);
    i++;
}
```
- do-while Loop: Executes a block of code once first, then repeats it as long as a specified condition is met.
  For example:
```
int i = 0;
do {
    System.out.println(i);
    i++;
} while (i < 5);
```
Jump Structures:
- break Statement: Exits the current loop or switch statement.
  For example:
```
for (int i = 0; i < 5; i++) {
    if (i == 3) {
        break;
    }
    System.out.println(i);
}
```
- continue Statement: Skips the remaining code in the current loop iteration and proceeds to the next iteration.
  For example:
```
for (int i = 0; i < 5; i++) {
    if (i == 3) {
        continue;
    }
    System.out.println(i);
}
```
- return Statement: Returns the execution result of a function.
  For example:
```
public int add(int a, int b) {
    int c = a + b;
    return c;
}
```