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float angle = 0.0;
float theta = radians(3);
float w = 300;
float h = 300;
 
void setup() {
  size(800, 600);
  colorMode(HSB, 360, 100, 100);
  rectMode(CENTER);
 
  background(random(360), 100, 100);
}
void draw() {
  translate(mouseX, mouseY);
  rotate(angle);
  rect(0, 0, w, h);
  angle += theta;
}
void mousePressed() {
  background(random(360), 100, 100);
  theta = -theta;
}
 

Main.java:1: error: class, interface, or enum expected
float angle = 0.0;
^
Main.java:2: error: class, interface, or enum expected
float theta = radians(3);
^
Main.java:3: error: class, interface, or enum expected
float w = 300;
^
Main.java:4: error: class, interface, or enum expected
float h = 300;
^
Main.java:6: error: class, interface, or enum expected
void setup() {
^
Main.java:8: error: class, interface, or enum expected
  colorMode(HSB, 360, 100, 100);
  ^
Main.java:9: error: class, interface, or enum expected
  rectMode(CENTER);
  ^
Main.java:11: error: class, interface, or enum expected
  background(random(360), 100, 100);
  ^
Main.java:12: error: class, interface, or enum expected
}
^
Main.java:15: error: class, interface, or enum expected
  rotate(angle);
  ^
Main.java:16: error: class, interface, or enum expected
  rect(0, 0, w, h);
  ^
Main.java:17: error: class, interface, or enum expected
  angle += theta;
  ^
Main.java:18: error: class, interface, or enum expected
}
^
Main.java:21: error: class, interface, or enum expected
  theta = -theta;
  ^
Main.java:22: error: class, interface, or enum expected
}
^
15 errors

Standard output is empty