• if else
• switch
• while
• for
• for each
• multiple loops: break

if (condition == true) {
    System.out.println("Do something...");
} else if (condition2 == true) {
    System.out.println("Do something else...");
} else {
    System.out.println("no condtition true!");
}

// example input
int day = 5;

/* dont forget to BREAK after each statement! otherwise 
 * all the statements below will be executed as well!
 */ 
switch (day) {
    case 1: 
        System.out.println("monday");
        break;                                 // break after each case
    case 2: 
        System.out.println("tuesday");
        break;                                 // break after each case
    case 3:
        System.out.println("wednesday");
        break;                                 // break after each case
    case 4:
        System.out.println("thursday");
        break;                                 // break after each case
    case 5:
        System.out.println("friday");
        break;                                // break after each case
    case 6: case: 7                       // combine two cases
        System.out.println("weekend!");
        break;                                // break after each case
    // DEFAULT will be run when no case is chosen! (similar to else)
    default:
        System.out.println("illegal input!");
        // if default is last case no need to break
        // add BREAK only when default is not last!
}

boolean condition = true;
while (condition == true) {
    System.out.println("i will print this unless condition is met");
    if (Math.random()<0.1) {  // condition will be met with 10% probability
        condition = false;
    }
}

for (int i=0; i<=10; i++) {     // increment +1 each round
    System.out.println("current run: " + i);
}

for (int i=0; i<=10; i+=2) {    // increment +2 each round
    System.out.println("current run: " + i);
}

for (int i=100; i>=0; i-=10) {  // decrement +10 each round
    System.out.println("current run: " + i);
}

// int[]
int[] zahlen = {1,4,7,2};
for (int zahl : zahlen) {
    System.out.println(zahl);
}

// possible also for other more complex datatypes like HashMap, ArrayList or Objects!
ArrayList<String> arrListStr = new ArrayList<String>();
arrListStr.add("first string");
arrListStr.add("second string");
arrListStr.add("third string");
for (String s : arrListStr) {
    System.out.println(zahl);
}

// Loop1 is a label for the first loop
Loop1: 
for (;;) {  // for (;;){} is an endless loop, same as while(true)
    for (;;) {
        statement; 
        if (condition) { 
             break Loop1;
        }
    }
}